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Finding the Fourth Proportional to 672.86, 928.08 and 423.98

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Solution

The fourth proportional to 672.86, 928.08 and 423.98 is: 584.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.86 : 928.08 = 423.98 : x
  2. Step 2: Convert to fraction form
    672.86/928.08 = 423.98/x
  3. Step 3: Cross multiply
    672.86x = 928.08 × 423.98
  4. Step 4: Simplify right side
    672.86x = 393,487.36
  5. Step 5: Solve for x
    x = 393,487.36/672.86
  6. Step 6: Final answer
    x = 584.80

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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.