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Finding the Fourth Proportional to 680.48, 939.12 and 385.76

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Solution

The fourth proportional to 680.48, 939.12 and 385.76 is: 532.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.48 : 939.12 = 385.76 : x
  2. Step 2: Convert to fraction form
    680.48/939.12 = 385.76/x
  3. Step 3: Cross multiply
    680.48x = 939.12 × 385.76
  4. Step 4: Simplify right side
    680.48x = 362,274.93
  5. Step 5: Solve for x
    x = 362,274.93/680.48
  6. Step 6: Final answer
    x = 532.38

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1.5x scale

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.