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Finding the Fourth Proportional to 715.90, 987.81 and 605.14

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Solution

The fourth proportional to 715.90, 987.81 and 605.14 is: 834.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.90 : 987.81 = 605.14 : x
  2. Step 2: Convert to fraction form
    715.90/987.81 = 605.14/x
  3. Step 3: Cross multiply
    715.90x = 987.81 × 605.14
  4. Step 4: Simplify right side
    715.90x = 597,763.34
  5. Step 5: Solve for x
    x = 597,763.34/715.90
  6. Step 6: Final answer
    x = 834.98

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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.