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Finding the Fourth Proportional to 121,428.80, 182,143.20 and 93,402.80

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Solution

The fourth proportional to 121,428.80, 182,143.20 and 93,402.80 is: 140,104.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,428.80 : 182,143.20 = 93,402.80 : x
  2. Step 2: Convert to fraction form
    121,428.80/182,143.20 = 93,402.80/x
  3. Step 3: Cross multiply
    121,428.80x = 182,143.20 × 93,402.80
  4. Step 4: Simplify right side
    121,428.80x = 17,012,684,880.96
  5. Step 5: Solve for x
    x = 17,012,684,880.96/121,428.80
  6. Step 6: Final answer
    x = 140,104.20

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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.