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Finding the Fourth Proportional to 280.06, 420.09 and 117.86

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Solution

The fourth proportional to 280.06, 420.09 and 117.86 is: 176.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.06 : 420.09 = 117.86 : x
  2. Step 2: Convert to fraction form
    280.06/420.09 = 117.86/x
  3. Step 3: Cross multiply
    280.06x = 420.09 × 117.86
  4. Step 4: Simplify right side
    280.06x = 49,509.26
  5. Step 5: Solve for x
    x = 49,509.26/280.06
  6. Step 6: Final answer
    x = 176.78

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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.