Home / 129,430.56-178,669.29-87,013.70

Finding the Fourth Proportional to 129,430.56, 178,669.29 and 87,013.70

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Solution

The fourth proportional to 129,430.56, 178,669.29 and 87,013.70 is: 120,115.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,430.56 : 178,669.29 = 87,013.70 : x
  2. Step 2: Convert to fraction form
    129,430.56/178,669.29 = 87,013.70/x
  3. Step 3: Cross multiply
    129,430.56x = 178,669.29 × 87,013.70
  4. Step 4: Simplify right side
    129,430.56x = 15,546,674,670.86
  5. Step 5: Solve for x
    x = 15,546,674,670.86/129,430.56
  6. Step 6: Final answer
    x = 120,115.95

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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.