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Finding the Fourth Proportional to 1,145.38, 1,580.54 and 673.30

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Solution

The fourth proportional to 1,145.38, 1,580.54 and 673.30 is: 929.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.38 : 1,580.54 = 673.30 : x
  2. Step 2: Convert to fraction form
    1,145.38/1,580.54 = 673.30/x
  3. Step 3: Cross multiply
    1,145.38x = 1,580.54 × 673.30
  4. Step 4: Simplify right side
    1,145.38x = 1,064,169.19
  5. Step 5: Solve for x
    x = 1,064,169.19/1,145.38
  6. Step 6: Final answer
    x = 929.10

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,146.38, 1,581.92 and 674.30
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.