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Finding the Fourth Proportional to 98,434.40, 147,432.90 and 80,938.40

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Solution

The fourth proportional to 98,434.40, 147,432.90 and 80,938.40 is: 121,227.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,434.40 : 147,432.90 = 80,938.40 : x
  2. Step 2: Convert to fraction form
    98,434.40/147,432.90 = 80,938.40/x
  3. Step 3: Cross multiply
    98,434.40x = 147,432.90 × 80,938.40
  4. Step 4: Simplify right side
    98,434.40x = 11,932,983,033.36
  5. Step 5: Solve for x
    x = 11,932,983,033.36/98,434.40
  6. Step 6: Final answer
    x = 121,227.77

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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.