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Finding the Fourth Proportional to 21,124.80, 29,207.88 and 18,500.40

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Solution

The fourth proportional to 21,124.80, 29,207.88 and 18,500.40 is: 25,579.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,124.80 : 29,207.88 = 18,500.40 : x
  2. Step 2: Convert to fraction form
    21,124.80/29,207.88 = 18,500.40/x
  3. Step 3: Cross multiply
    21,124.80x = 29,207.88 × 18,500.40
  4. Step 4: Simplify right side
    21,124.80x = 540,357,463.15
  5. Step 5: Solve for x
    x = 540,357,463.15/21,124.80
  6. Step 6: Final answer
    x = 25,579.29

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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.