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Finding the Fourth Proportional to 108,831.80, 163,074.90 and 80,838.20

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Solution

The fourth proportional to 108,831.80, 163,074.90 and 80,838.20 is: 121,128.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,831.80 : 163,074.90 = 80,838.20 : x
  2. Step 2: Convert to fraction form
    108,831.80/163,074.90 = 80,838.20/x
  3. Step 3: Cross multiply
    108,831.80x = 163,074.90 × 80,838.20
  4. Step 4: Simplify right side
    108,831.80x = 13,182,681,381.18
  5. Step 5: Solve for x
    x = 13,182,681,381.18/108,831.80
  6. Step 6: Final answer
    x = 121,128.95

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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.