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Finding the Fourth Proportional to 98,400.40, 147,381.90 and 80,904.40

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Solution

The fourth proportional to 98,400.40, 147,381.90 and 80,904.40 is: 121,176.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,400.40 : 147,381.90 = 80,904.40 : x
  2. Step 2: Convert to fraction form
    98,400.40/147,381.90 = 80,904.40/x
  3. Step 3: Cross multiply
    98,400.40x = 147,381.90 × 80,904.40
  4. Step 4: Simplify right side
    98,400.40x = 11,923,844,190.36
  5. Step 5: Solve for x
    x = 11,923,844,190.36/98,400.40
  6. Step 6: Final answer
    x = 121,176.79

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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.