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Finding the Fourth Proportional to 99,993.12, 137,990.16 and 55,281.12

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Solution

The fourth proportional to 99,993.12, 137,990.16 and 55,281.12 is: 76,287.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,993.12 : 137,990.16 = 55,281.12 : x
  2. Step 2: Convert to fraction form
    99,993.12/137,990.16 = 55,281.12/x
  3. Step 3: Cross multiply
    99,993.12x = 137,990.16 × 55,281.12
  4. Step 4: Simplify right side
    99,993.12x = 7,628,250,593.78
  5. Step 5: Solve for x
    x = 7,628,250,593.78/99,993.12
  6. Step 6: Final answer
    x = 76,287.75

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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.