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Finding the Fourth Proportional to 99,378.92, 137,187.70 and 65,405.25

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Solution

The fourth proportional to 99,378.92, 137,187.70 and 65,405.25 is: 90,288.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,378.92 : 137,187.70 = 65,405.25 : x
  2. Step 2: Convert to fraction form
    99,378.92/137,187.70 = 65,405.25/x
  3. Step 3: Cross multiply
    99,378.92x = 137,187.70 × 65,405.25
  4. Step 4: Simplify right side
    99,378.92x = 8,972,795,651.91
  5. Step 5: Solve for x
    x = 8,972,795,651.91/99,378.92
  6. Step 6: Final answer
    x = 90,288.72

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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.