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Finding the Fourth Proportional to 279.61, 419.43 and 117.13

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Solution

The fourth proportional to 279.61, 419.43 and 117.13 is: 175.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.61 : 419.43 = 117.13 : x
  2. Step 2: Convert to fraction form
    279.61/419.43 = 117.13/x
  3. Step 3: Cross multiply
    279.61x = 419.43 × 117.13
  4. Step 4: Simplify right side
    279.61x = 49,127.84
  5. Step 5: Solve for x
    x = 49,127.84/279.61
  6. Step 6: Final answer
    x = 175.70

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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.