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Finding the Fourth Proportional to 76,937.60, 115,406.40 and 72,660.80

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Solution

The fourth proportional to 76,937.60, 115,406.40 and 72,660.80 is: 108,991.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,937.60 : 115,406.40 = 72,660.80 : x
  2. Step 2: Convert to fraction form
    76,937.60/115,406.40 = 72,660.80/x
  3. Step 3: Cross multiply
    76,937.60x = 115,406.40 × 72,660.80
  4. Step 4: Simplify right side
    76,937.60x = 8,385,521,349.12
  5. Step 5: Solve for x
    x = 8,385,521,349.12/76,937.60
  6. Step 6: Final answer
    x = 108,991.20

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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.