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Finding the Fourth Proportional to 140,916.80, 211,375.20 and 42,420.80

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Solution

The fourth proportional to 140,916.80, 211,375.20 and 42,420.80 is: 63,631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,916.80 : 211,375.20 = 42,420.80 : x
  2. Step 2: Convert to fraction form
    140,916.80/211,375.20 = 42,420.80/x
  3. Step 3: Cross multiply
    140,916.80x = 211,375.20 × 42,420.80
  4. Step 4: Simplify right side
    140,916.80x = 8,966,705,084.16
  5. Step 5: Solve for x
    x = 8,966,705,084.16/140,916.80
  6. Step 6: Final answer
    x = 63,631.20

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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.