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Finding the Fourth Proportional to 1,010.31, 1,515.92 and 455.15

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Solution

The fourth proportional to 1,010.31, 1,515.92 and 455.15 is: 682.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.31 : 1,515.92 = 455.15 : x
  2. Step 2: Convert to fraction form
    1,010.31/1,515.92 = 455.15/x
  3. Step 3: Cross multiply
    1,010.31x = 1,515.92 × 455.15
  4. Step 4: Simplify right side
    1,010.31x = 689,972.50
  5. Step 5: Solve for x
    x = 689,972.50/1,010.31
  6. Step 6: Final answer
    x = 682.93

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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.