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Finding the Fourth Proportional to 712.86, 1,070.28 and 655.62

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Solution

The fourth proportional to 712.86, 1,070.28 and 655.62 is: 984.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.86 : 1,070.28 = 655.62 : x
  2. Step 2: Convert to fraction form
    712.86/1,070.28 = 655.62/x
  3. Step 3: Cross multiply
    712.86x = 1,070.28 × 655.62
  4. Step 4: Simplify right side
    712.86x = 701,696.97
  5. Step 5: Solve for x
    x = 701,696.97/712.86
  6. Step 6: Final answer
    x = 984.34

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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.