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Finding the Fourth Proportional to 715.14, 986.34 and 615.71

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Solution

The fourth proportional to 715.14, 986.34 and 615.71 is: 849.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.14 : 986.34 = 615.71 : x
  2. Step 2: Convert to fraction form
    715.14/986.34 = 615.71/x
  3. Step 3: Cross multiply
    715.14x = 986.34 × 615.71
  4. Step 4: Simplify right side
    715.14x = 607,299.40
  5. Step 5: Solve for x
    x = 607,299.40/715.14
  6. Step 6: Final answer
    x = 849.20

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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.