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Finding the Fourth Proportional to 42,711.70, 64,067.55 and 19,019.20

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Solution

The fourth proportional to 42,711.70, 64,067.55 and 19,019.20 is: 28,528.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,711.70 : 64,067.55 = 19,019.20 : x
  2. Step 2: Convert to fraction form
    42,711.70/64,067.55 = 19,019.20/x
  3. Step 3: Cross multiply
    42,711.70x = 64,067.55 × 19,019.20
  4. Step 4: Simplify right side
    42,711.70x = 1,218,513,546.96
  5. Step 5: Solve for x
    x = 1,218,513,546.96/42,711.70
  6. Step 6: Final answer
    x = 28,528.80

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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.