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Finding the Fourth Proportional to 129.09, 193.59 and 56.91

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Solution

The fourth proportional to 129.09, 193.59 and 56.91 is: 85.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.09 : 193.59 = 56.91 : x
  2. Step 2: Convert to fraction form
    129.09/193.59 = 56.91/x
  3. Step 3: Cross multiply
    129.09x = 193.59 × 56.91
  4. Step 4: Simplify right side
    129.09x = 11,017.69
  5. Step 5: Solve for x
    x = 11,017.69/129.09
  6. Step 6: Final answer
    x = 85.35

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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.