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Finding the Fourth Proportional to 715.87, 988.18 and 605.91

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Solution

The fourth proportional to 715.87, 988.18 and 605.91 is: 836.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.87 : 988.18 = 605.91 : x
  2. Step 2: Convert to fraction form
    715.87/988.18 = 605.91/x
  3. Step 3: Cross multiply
    715.87x = 988.18 × 605.91
  4. Step 4: Simplify right side
    715.87x = 598,748.14
  5. Step 5: Solve for x
    x = 598,748.14/715.87
  6. Step 6: Final answer
    x = 836.40

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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.