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Finding the Fourth Proportional to 129,988.95, 179,385.94 and 76,274.87

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Solution

The fourth proportional to 129,988.95, 179,385.94 and 76,274.87 is: 105,260.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,988.95 : 179,385.94 = 76,274.87 : x
  2. Step 2: Convert to fraction form
    129,988.95/179,385.94 = 76,274.87/x
  3. Step 3: Cross multiply
    129,988.95x = 179,385.94 × 76,274.87
  4. Step 4: Simplify right side
    129,988.95x = 13,682,638,451.74
  5. Step 5: Solve for x
    x = 13,682,638,451.74/129,988.95
  6. Step 6: Final answer
    x = 105,260.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.