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Finding the Fourth Proportional to 215,990.79, 324,130.80 and 89,631.16

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Solution

The fourth proportional to 215,990.79, 324,130.80 and 89,631.16 is: 134,506.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,990.79 : 324,130.80 = 89,631.16 : x
  2. Step 2: Convert to fraction form
    215,990.79/324,130.80 = 89,631.16/x
  3. Step 3: Cross multiply
    215,990.79x = 324,130.80 × 89,631.16
  4. Step 4: Simplify right side
    215,990.79x = 29,052,218,995.47
  5. Step 5: Solve for x
    x = 29,052,218,995.47/215,990.79
  6. Step 6: Final answer
    x = 134,506.75

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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.