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Finding the Fourth Proportional to 515.67, 711.55 and 291.60

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Solution

The fourth proportional to 515.67, 711.55 and 291.60 is: 402.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.67 : 711.55 = 291.60 : x
  2. Step 2: Convert to fraction form
    515.67/711.55 = 291.60/x
  3. Step 3: Cross multiply
    515.67x = 711.55 × 291.60
  4. Step 4: Simplify right side
    515.67x = 207,487.98
  5. Step 5: Solve for x
    x = 207,487.98/515.67
  6. Step 6: Final answer
    x = 402.37

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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.