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Finding the Fourth Proportional to 713.90, 985.07 and 415.21

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Solution

The fourth proportional to 713.90, 985.07 and 415.21 is: 572.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.90 : 985.07 = 415.21 : x
  2. Step 2: Convert to fraction form
    713.90/985.07 = 415.21/x
  3. Step 3: Cross multiply
    713.90x = 985.07 × 415.21
  4. Step 4: Simplify right side
    713.90x = 409,010.91
  5. Step 5: Solve for x
    x = 409,010.91/713.90
  6. Step 6: Final answer
    x = 572.92

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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.