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Finding the Fourth Proportional to 68,721.60, 103,082.40 and 21,979.20

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Solution

The fourth proportional to 68,721.60, 103,082.40 and 21,979.20 is: 32,968.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,721.60 : 103,082.40 = 21,979.20 : x
  2. Step 2: Convert to fraction form
    68,721.60/103,082.40 = 21,979.20/x
  3. Step 3: Cross multiply
    68,721.60x = 103,082.40 × 21,979.20
  4. Step 4: Simplify right side
    68,721.60x = 2,265,668,686.08
  5. Step 5: Solve for x
    x = 2,265,668,686.08/68,721.60
  6. Step 6: Final answer
    x = 32,968.80

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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.