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Finding the Fourth Proportional to 672.77, 928.56 and 392.99

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Solution

The fourth proportional to 672.77, 928.56 and 392.99 is: 542.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.77 : 928.56 = 392.99 : x
  2. Step 2: Convert to fraction form
    672.77/928.56 = 392.99/x
  3. Step 3: Cross multiply
    672.77x = 928.56 × 392.99
  4. Step 4: Simplify right side
    672.77x = 364,910.15
  5. Step 5: Solve for x
    x = 364,910.15/672.77
  6. Step 6: Final answer
    x = 542.40

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Double scale
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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.