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Finding the Fourth Proportional to 99,990.80, 137,989.90 and 54,670.68

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Solution

The fourth proportional to 99,990.80, 137,989.90 and 54,670.68 is: 75,446.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,990.80 : 137,989.90 = 54,670.68 : x
  2. Step 2: Convert to fraction form
    99,990.80/137,989.90 = 54,670.68/x
  3. Step 3: Cross multiply
    99,990.80x = 137,989.90 × 54,670.68
  4. Step 4: Simplify right side
    99,990.80x = 7,544,001,666.13
  5. Step 5: Solve for x
    x = 7,544,001,666.13/99,990.80
  6. Step 6: Final answer
    x = 75,446.96

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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.