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Finding the Fourth Proportional to 907.92, 1,253.04 and 515.07

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Solution

The fourth proportional to 907.92, 1,253.04 and 515.07 is: 710.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.92 : 1,253.04 = 515.07 : x
  2. Step 2: Convert to fraction form
    907.92/1,253.04 = 515.07/x
  3. Step 3: Cross multiply
    907.92x = 1,253.04 × 515.07
  4. Step 4: Simplify right side
    907.92x = 645,403.31
  5. Step 5: Solve for x
    x = 645,403.31/907.92
  6. Step 6: Final answer
    x = 710.86

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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.