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Finding the Fourth Proportional to 672.81, 928.59 and 393.18

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Solution

The fourth proportional to 672.81, 928.59 and 393.18 is: 542.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.81 : 928.59 = 393.18 : x
  2. Step 2: Convert to fraction form
    672.81/928.59 = 393.18/x
  3. Step 3: Cross multiply
    672.81x = 928.59 × 393.18
  4. Step 4: Simplify right side
    672.81x = 365,103.02
  5. Step 5: Solve for x
    x = 365,103.02/672.81
  6. Step 6: Final answer
    x = 542.65

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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.