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Finding the Fourth Proportional to 129,987.59, 179,280.95 and 84,679.83

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Solution

The fourth proportional to 129,987.59, 179,280.95 and 84,679.83 is: 116,791.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,987.59 : 179,280.95 = 84,679.83 : x
  2. Step 2: Convert to fraction form
    129,987.59/179,280.95 = 84,679.83/x
  3. Step 3: Cross multiply
    129,987.59x = 179,280.95 × 84,679.83
  4. Step 4: Simplify right side
    129,987.59x = 15,181,479,944.84
  5. Step 5: Solve for x
    x = 15,181,479,944.84/129,987.59
  6. Step 6: Final answer
    x = 116,791.77

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1.5x scale

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.