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Finding the Fourth Proportional to 488.80, 732.12 and 421.36

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Solution

The fourth proportional to 488.80, 732.12 and 421.36 is: 631.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.80 : 732.12 = 421.36 : x
  2. Step 2: Convert to fraction form
    488.80/732.12 = 421.36/x
  3. Step 3: Cross multiply
    488.80x = 732.12 × 421.36
  4. Step 4: Simplify right side
    488.80x = 308,486.08
  5. Step 5: Solve for x
    x = 308,486.08/488.80
  6. Step 6: Final answer
    x = 631.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.