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Finding the Fourth Proportional to 672.96, 928.66 and 393.21

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Solution

The fourth proportional to 672.96, 928.66 and 393.21 is: 542.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.96 : 928.66 = 393.21 : x
  2. Step 2: Convert to fraction form
    672.96/928.66 = 393.21/x
  3. Step 3: Cross multiply
    672.96x = 928.66 × 393.21
  4. Step 4: Simplify right side
    672.96x = 365,158.40
  5. Step 5: Solve for x
    x = 365,158.40/672.96
  6. Step 6: Final answer
    x = 542.62

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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.