Home / 90,708.87-125,134.70-78,111.75

Finding the Fourth Proportional to 90,708.87, 125,134.70 and 78,111.75

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Solution

The fourth proportional to 90,708.87, 125,134.70 and 78,111.75 is: 107,756.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,708.87 : 125,134.70 = 78,111.75 : x
  2. Step 2: Convert to fraction form
    90,708.87/125,134.70 = 78,111.75/x
  3. Step 3: Cross multiply
    90,708.87x = 125,134.70 × 78,111.75
  4. Step 4: Simplify right side
    90,708.87x = 9,774,490,012.17
  5. Step 5: Solve for x
    x = 9,774,490,012.17/90,708.87
  6. Step 6: Final answer
    x = 107,756.72

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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.