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Finding the Fourth Proportional to 98,378.88, 147,668.76 and 72,005.28

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Solution

The fourth proportional to 98,378.88, 147,668.76 and 72,005.28 is: 108,081.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,378.88 : 147,668.76 = 72,005.28 : x
  2. Step 2: Convert to fraction form
    98,378.88/147,668.76 = 72,005.28/x
  3. Step 3: Cross multiply
    98,378.88x = 147,668.76 × 72,005.28
  4. Step 4: Simplify right side
    98,378.88x = 10,632,930,411.05
  5. Step 5: Solve for x
    x = 10,632,930,411.05/98,378.88
  6. Step 6: Final answer
    x = 108,081.43

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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.