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Finding the Fourth Proportional to 946.31, 1,305.48 and 553.15

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Solution

The fourth proportional to 946.31, 1,305.48 and 553.15 is: 763.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.31 : 1,305.48 = 553.15 : x
  2. Step 2: Convert to fraction form
    946.31/1,305.48 = 553.15/x
  3. Step 3: Cross multiply
    946.31x = 1,305.48 × 553.15
  4. Step 4: Simplify right side
    946.31x = 722,129.97
  5. Step 5: Solve for x
    x = 722,129.97/946.31
  6. Step 6: Final answer
    x = 763.10

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Double scale
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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.