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Finding the Fourth Proportional to 672.98, 928.68 and 393.24

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Solution

The fourth proportional to 672.98, 928.68 and 393.24 is: 542.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.98 : 928.68 = 393.24 : x
  2. Step 2: Convert to fraction form
    672.98/928.68 = 393.24/x
  3. Step 3: Cross multiply
    672.98x = 928.68 × 393.24
  4. Step 4: Simplify right side
    672.98x = 365,187.51
  5. Step 5: Solve for x
    x = 365,187.51/672.98
  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.