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Finding the Fourth Proportional to 19,901.80, 29,820.30 and 17,115.40

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Solution

The fourth proportional to 19,901.80, 29,820.30 and 17,115.40 is: 25,645.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,901.80 : 29,820.30 = 17,115.40 : x
  2. Step 2: Convert to fraction form
    19,901.80/29,820.30 = 17,115.40/x
  3. Step 3: Cross multiply
    19,901.80x = 29,820.30 × 17,115.40
  4. Step 4: Simplify right side
    19,901.80x = 510,386,362.62
  5. Step 5: Solve for x
    x = 510,386,362.62/19,901.80
  6. Step 6: Final answer
    x = 25,645.24

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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.