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Finding the Fourth Proportional to 71,574.27, 107,353.21 and 18,987.86

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Solution

The fourth proportional to 71,574.27, 107,353.21 and 18,987.86 is: 28,479.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,574.27 : 107,353.21 = 18,987.86 : x
  2. Step 2: Convert to fraction form
    71,574.27/107,353.21 = 18,987.86/x
  3. Step 3: Cross multiply
    71,574.27x = 107,353.21 × 18,987.86
  4. Step 4: Simplify right side
    71,574.27x = 2,038,407,722.03
  5. Step 5: Solve for x
    x = 2,038,407,722.03/71,574.27
  6. Step 6: Final answer
    x = 28,479.62

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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.