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Finding the Fourth Proportional to 1,010.31, 1,515.06 and 425.58

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Solution

The fourth proportional to 1,010.31, 1,515.06 and 425.58 is: 638.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.31 : 1,515.06 = 425.58 : x
  2. Step 2: Convert to fraction form
    1,010.31/1,515.06 = 425.58/x
  3. Step 3: Cross multiply
    1,010.31x = 1,515.06 × 425.58
  4. Step 4: Simplify right side
    1,010.31x = 644,779.23
  5. Step 5: Solve for x
    x = 644,779.23/1,010.31
  6. Step 6: Final answer
    x = 638.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.