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Finding the Fourth Proportional to 25,128.48, 34,752.48 and 21,979.20

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Solution

The fourth proportional to 25,128.48, 34,752.48 and 21,979.20 is: 30,397.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,128.48 : 34,752.48 = 21,979.20 : x
  2. Step 2: Convert to fraction form
    25,128.48/34,752.48 = 21,979.20/x
  3. Step 3: Cross multiply
    25,128.48x = 34,752.48 × 21,979.20
  4. Step 4: Simplify right side
    25,128.48x = 763,831,708.42
  5. Step 5: Solve for x
    x = 763,831,708.42/25,128.48
  6. Step 6: Final answer
    x = 30,397.05

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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.