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Finding the Fourth Proportional to 457.19, 630.70 and 280.09

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Solution

The fourth proportional to 457.19, 630.70 and 280.09 is: 386.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.19 : 630.70 = 280.09 : x
  2. Step 2: Convert to fraction form
    457.19/630.70 = 280.09/x
  3. Step 3: Cross multiply
    457.19x = 630.70 × 280.09
  4. Step 4: Simplify right side
    457.19x = 176,652.76
  5. Step 5: Solve for x
    x = 176,652.76/457.19
  6. Step 6: Final answer
    x = 386.39

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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.