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Finding the Fourth Proportional to 280.13, 420.24 and 115.58

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Solution

The fourth proportional to 280.13, 420.24 and 115.58 is: 173.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.13 : 420.24 = 115.58 : x
  2. Step 2: Convert to fraction form
    280.13/420.24 = 115.58/x
  3. Step 3: Cross multiply
    280.13x = 420.24 × 115.58
  4. Step 4: Simplify right side
    280.13x = 48,569.81
  5. Step 5: Solve for x
    x = 48,569.81/280.13
  6. Step 6: Final answer
    x = 173.38

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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.