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Finding the Fourth Proportional to 29,402.80, 40,629.36 and 21,431.20

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Solution

The fourth proportional to 29,402.80, 40,629.36 and 21,431.20 is: 29,614.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,402.80 : 40,629.36 = 21,431.20 : x
  2. Step 2: Convert to fraction form
    29,402.80/40,629.36 = 21,431.20/x
  3. Step 3: Cross multiply
    29,402.80x = 40,629.36 × 21,431.20
  4. Step 4: Simplify right side
    29,402.80x = 870,735,940.03
  5. Step 5: Solve for x
    x = 870,735,940.03/29,402.80
  6. Step 6: Final answer
    x = 29,614.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.