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Finding the Fourth Proportional to 109,387.40, 163,821.90 and 74,136.20

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Solution

The fourth proportional to 109,387.40, 163,821.90 and 74,136.20 is: 111,028.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,387.40 : 163,821.90 = 74,136.20 : x
  2. Step 2: Convert to fraction form
    109,387.40/163,821.90 = 74,136.20/x
  3. Step 3: Cross multiply
    109,387.40x = 163,821.90 × 74,136.20
  4. Step 4: Simplify right side
    109,387.40x = 12,145,133,142.78
  5. Step 5: Solve for x
    x = 12,145,133,142.78/109,387.40
  6. Step 6: Final answer
    x = 111,028.63

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1.5x scale

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.