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Finding the Fourth Proportional to 19,959.20, 29,938.80 and 17,712.80

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Solution

The fourth proportional to 19,959.20, 29,938.80 and 17,712.80 is: 26,569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,959.20 : 29,938.80 = 17,712.80 : x
  2. Step 2: Convert to fraction form
    19,959.20/29,938.80 = 17,712.80/x
  3. Step 3: Cross multiply
    19,959.20x = 29,938.80 × 17,712.80
  4. Step 4: Simplify right side
    19,959.20x = 530,299,976.64
  5. Step 5: Solve for x
    x = 530,299,976.64/19,959.20
  6. Step 6: Final answer
    x = 26,569.20

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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.