Home / 109,128.20-163,538.70-80,827.40

Finding the Fourth Proportional to 109,128.20, 163,538.70 and 80,827.40

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Solution

The fourth proportional to 109,128.20, 163,538.70 and 80,827.40 is: 121,127.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,128.20 : 163,538.70 = 80,827.40 : x
  2. Step 2: Convert to fraction form
    109,128.20/163,538.70 = 80,827.40/x
  3. Step 3: Cross multiply
    109,128.20x = 163,538.70 × 80,827.40
  4. Step 4: Simplify right side
    109,128.20x = 13,218,407,920.38
  5. Step 5: Solve for x
    x = 13,218,407,920.38/109,128.20
  6. Step 6: Final answer
    x = 121,127.33

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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.