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Finding the Fourth Proportional to 715.10, 1,072.65 and 655.70

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Solution

The fourth proportional to 715.10, 1,072.65 and 655.70 is: 983.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.10 : 1,072.65 = 655.70 : x
  2. Step 2: Convert to fraction form
    715.10/1,072.65 = 655.70/x
  3. Step 3: Cross multiply
    715.10x = 1,072.65 × 655.70
  4. Step 4: Simplify right side
    715.10x = 703,336.61
  5. Step 5: Solve for x
    x = 703,336.61/715.10
  6. Step 6: Final answer
    x = 983.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.