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Finding the Fourth Proportional to 279.60, 419.51 and 117.40

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Solution

The fourth proportional to 279.60, 419.51 and 117.40 is: 176.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.60 : 419.51 = 117.40 : x
  2. Step 2: Convert to fraction form
    279.60/419.51 = 117.40/x
  3. Step 3: Cross multiply
    279.60x = 419.51 × 117.40
  4. Step 4: Simplify right side
    279.60x = 49,250.47
  5. Step 5: Solve for x
    x = 49,250.47/279.60
  6. Step 6: Final answer
    x = 176.15

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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.