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Finding the Fourth Proportional to 279.64, 419.52 and 87.26

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Solution

The fourth proportional to 279.64, 419.52 and 87.26 is: 130.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.64 : 419.52 = 87.26 : x
  2. Step 2: Convert to fraction form
    279.64/419.52 = 87.26/x
  3. Step 3: Cross multiply
    279.64x = 419.52 × 87.26
  4. Step 4: Simplify right side
    279.64x = 36,607.32
  5. Step 5: Solve for x
    x = 36,607.32/279.64
  6. Step 6: Final answer
    x = 130.91

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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.