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Finding the Fourth Proportional to 486.61, 730.05 and 281.06

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Solution

The fourth proportional to 486.61, 730.05 and 281.06 is: 421.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.61 : 730.05 = 281.06 : x
  2. Step 2: Convert to fraction form
    486.61/730.05 = 281.06/x
  3. Step 3: Cross multiply
    486.61x = 730.05 × 281.06
  4. Step 4: Simplify right side
    486.61x = 205,191.55
  5. Step 5: Solve for x
    x = 205,191.55/486.61
  6. Step 6: Final answer
    x = 421.68

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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.