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Finding the Fourth Proportional to 946.40, 1,306.20 and 553.52

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Solution

The fourth proportional to 946.40, 1,306.20 and 553.52 is: 763.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.40 : 1,306.20 = 553.52 : x
  2. Step 2: Convert to fraction form
    946.40/1,306.20 = 553.52/x
  3. Step 3: Cross multiply
    946.40x = 1,306.20 × 553.52
  4. Step 4: Simplify right side
    946.40x = 723,007.82
  5. Step 5: Solve for x
    x = 723,007.82/946.40
  6. Step 6: Final answer
    x = 763.96

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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.