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Finding the Fourth Proportional to 88,739.60, 133,109.40 and 81,981.20

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Solution

The fourth proportional to 88,739.60, 133,109.40 and 81,981.20 is: 122,971.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,739.60 : 133,109.40 = 81,981.20 : x
  2. Step 2: Convert to fraction form
    88,739.60/133,109.40 = 81,981.20/x
  3. Step 3: Cross multiply
    88,739.60x = 133,109.40 × 81,981.20
  4. Step 4: Simplify right side
    88,739.60x = 10,912,468,343.28
  5. Step 5: Solve for x
    x = 10,912,468,343.28/88,739.60
  6. Step 6: Final answer
    x = 122,971.80

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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.