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Finding the Fourth Proportional to 688.80, 937.92 and 688.80

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Solution

The fourth proportional to 688.80, 937.92 and 688.80 is: 937.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.80 : 937.92 = 688.80 : x
  2. Step 2: Convert to fraction form
    688.80/937.92 = 688.80/x
  3. Step 3: Cross multiply
    688.80x = 937.92 × 688.80
  4. Step 4: Simplify right side
    688.80x = 646,039.30
  5. Step 5: Solve for x
    x = 646,039.30/688.80
  6. Step 6: Final answer
    x = 937.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.