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Finding the Fourth Proportional to 78,500.80, 108,616.36 and 68,450.20

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Solution

The fourth proportional to 78,500.80, 108,616.36 and 68,450.20 is: 94,710.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,500.80 : 108,616.36 = 68,450.20 : x
  2. Step 2: Convert to fraction form
    78,500.80/108,616.36 = 68,450.20/x
  3. Step 3: Cross multiply
    78,500.80x = 108,616.36 × 68,450.20
  4. Step 4: Simplify right side
    78,500.80x = 7,434,811,565.27
  5. Step 5: Solve for x
    x = 7,434,811,565.27/78,500.80
  6. Step 6: Final answer
    x = 94,710.01

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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.