Home / 129,501.18-178,719.86-78,518.78

Finding the Fourth Proportional to 129,501.18, 178,719.86 and 78,518.78

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Solution

The fourth proportional to 129,501.18, 178,719.86 and 78,518.78 is: 108,360.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,501.18 : 178,719.86 = 78,518.78 : x
  2. Step 2: Convert to fraction form
    129,501.18/178,719.86 = 78,518.78/x
  3. Step 3: Cross multiply
    129,501.18x = 178,719.86 × 78,518.78
  4. Step 4: Simplify right side
    129,501.18x = 14,032,865,368.97
  5. Step 5: Solve for x
    x = 14,032,865,368.97/129,501.18
  6. Step 6: Final answer
    x = 108,360.91

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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.