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Finding the Fourth Proportional to 672.77, 928.49 and 393.19

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Solution

The fourth proportional to 672.77, 928.49 and 393.19 is: 542.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.77 : 928.49 = 393.19 : x
  2. Step 2: Convert to fraction form
    672.77/928.49 = 393.19/x
  3. Step 3: Cross multiply
    672.77x = 928.49 × 393.19
  4. Step 4: Simplify right side
    672.77x = 365,068.70
  5. Step 5: Solve for x
    x = 365,068.70/672.77
  6. Step 6: Final answer
    x = 542.63

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Half scale
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Double scale
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Similar ratio
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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.