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Finding the Fourth Proportional to 672.12, 928.08 and 561.60

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Solution

The fourth proportional to 672.12, 928.08 and 561.60 is: 775.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.12 : 928.08 = 561.60 : x
  2. Step 2: Convert to fraction form
    672.12/928.08 = 561.60/x
  3. Step 3: Cross multiply
    672.12x = 928.08 × 561.60
  4. Step 4: Simplify right side
    672.12x = 521,209.73
  5. Step 5: Solve for x
    x = 521,209.73/672.12
  6. Step 6: Final answer
    x = 775.47

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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.