Home / 129,376.09-178,503.15-77,679.76

Finding the Fourth Proportional to 129,376.09, 178,503.15 and 77,679.76

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Solution

The fourth proportional to 129,376.09, 178,503.15 and 77,679.76 is: 107,176.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,376.09 : 178,503.15 = 77,679.76 : x
  2. Step 2: Convert to fraction form
    129,376.09/178,503.15 = 77,679.76/x
  3. Step 3: Cross multiply
    129,376.09x = 178,503.15 × 77,679.76
  4. Step 4: Simplify right side
    129,376.09x = 13,866,081,851.24
  5. Step 5: Solve for x
    x = 13,866,081,851.24/129,376.09
  6. Step 6: Final answer
    x = 107,176.54

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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.