Home / 87,837.18-121,419.59-78,370.89

Finding the Fourth Proportional to 87,837.18, 121,419.59 and 78,370.89

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Solution

The fourth proportional to 87,837.18, 121,419.59 and 78,370.89 is: 108,334.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,837.18 : 121,419.59 = 78,370.89 : x
  2. Step 2: Convert to fraction form
    87,837.18/121,419.59 = 78,370.89/x
  3. Step 3: Cross multiply
    87,837.18x = 121,419.59 × 78,370.89
  4. Step 4: Simplify right side
    87,837.18x = 9,515,761,527.66
  5. Step 5: Solve for x
    x = 9,515,761,527.66/87,837.18
  6. Step 6: Final answer
    x = 108,334.10

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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.