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Finding the Fourth Proportional to 98,443.40, 147,686.70 and 31,872.20

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Solution

The fourth proportional to 98,443.40, 147,686.70 and 31,872.20 is: 47,815.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,443.40 : 147,686.70 = 31,872.20 : x
  2. Step 2: Convert to fraction form
    98,443.40/147,686.70 = 31,872.20/x
  3. Step 3: Cross multiply
    98,443.40x = 147,686.70 × 31,872.20
  4. Step 4: Simplify right side
    98,443.40x = 4,707,100,039.74
  5. Step 5: Solve for x
    x = 4,707,100,039.74/98,443.40
  6. Step 6: Final answer
    x = 47,815.29

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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.