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Finding the Fourth Proportional to 161,411.20, 242,116.80 and 91,427.20

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Solution

The fourth proportional to 161,411.20, 242,116.80 and 91,427.20 is: 137,140.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    161,411.20 : 242,116.80 = 91,427.20 : x
  2. Step 2: Convert to fraction form
    161,411.20/242,116.80 = 91,427.20/x
  3. Step 3: Cross multiply
    161,411.20x = 242,116.80 × 91,427.20
  4. Step 4: Simplify right side
    161,411.20x = 22,136,061,096.96
  5. Step 5: Solve for x
    x = 22,136,061,096.96/161,411.20
  6. Step 6: Final answer
    x = 137,140.80

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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.