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Finding the Fourth Proportional to 1,140.32, 1,573.65 and 668.10

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Solution

The fourth proportional to 1,140.32, 1,573.65 and 668.10 is: 921.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.32 : 1,573.65 = 668.10 : x
  2. Step 2: Convert to fraction form
    1,140.32/1,573.65 = 668.10/x
  3. Step 3: Cross multiply
    1,140.32x = 1,573.65 × 668.10
  4. Step 4: Simplify right side
    1,140.32x = 1,051,354.49
  5. Step 5: Solve for x
    x = 1,051,354.49/1,140.32
  6. Step 6: Final answer
    x = 921.99

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Half scale
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Double scale
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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.