Home / 1,225.38-1,689.88-945.18

Finding the Fourth Proportional to 1,225.38, 1,689.88 and 945.18

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Solution

The fourth proportional to 1,225.38, 1,689.88 and 945.18 is: 1,303.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.38 : 1,689.88 = 945.18 : x
  2. Step 2: Convert to fraction form
    1,225.38/1,689.88 = 945.18/x
  3. Step 3: Cross multiply
    1,225.38x = 1,689.88 × 945.18
  4. Step 4: Simplify right side
    1,225.38x = 1,597,227.60
  5. Step 5: Solve for x
    x = 1,597,227.60/1,225.38
  6. Step 6: Final answer
    x = 1,303.45

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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.