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Finding the Fourth Proportional to 72,087.40, 108,131.10 and 67,713.40

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Solution

The fourth proportional to 72,087.40, 108,131.10 and 67,713.40 is: 101,570.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,087.40 : 108,131.10 = 67,713.40 : x
  2. Step 2: Convert to fraction form
    72,087.40/108,131.10 = 67,713.40/x
  3. Step 3: Cross multiply
    72,087.40x = 108,131.10 × 67,713.40
  4. Step 4: Simplify right side
    72,087.40x = 7,321,924,426.74
  5. Step 5: Solve for x
    x = 7,321,924,426.74/72,087.40
  6. Step 6: Final answer
    x = 101,570.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.