Home / 90,712.12-125,139.16-78,115

Finding the Fourth Proportional to 90,712.12, 125,139.16 and 78,115

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Solution

The fourth proportional to 90,712.12, 125,139.16 and 78,115 is: 107,761.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,712.12 : 125,139.16 = 78,115 : x
  2. Step 2: Convert to fraction form
    90,712.12/125,139.16 = 78,115/x
  3. Step 3: Cross multiply
    90,712.12x = 125,139.16 × 78,115
  4. Step 4: Simplify right side
    90,712.12x = 9,775,245,483.40
  5. Step 5: Solve for x
    x = 9,775,245,483.40/90,712.12
  6. Step 6: Final answer
    x = 107,761.18

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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.