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Finding the Fourth Proportional to 129.61, 194.40 and 56.47

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Solution

The fourth proportional to 129.61, 194.40 and 56.47 is: 84.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.61 : 194.40 = 56.47 : x
  2. Step 2: Convert to fraction form
    129.61/194.40 = 56.47/x
  3. Step 3: Cross multiply
    129.61x = 194.40 × 56.47
  4. Step 4: Simplify right side
    129.61x = 10,977.77
  5. Step 5: Solve for x
    x = 10,977.77/129.61
  6. Step 6: Final answer
    x = 84.70

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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.