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Finding the Fourth Proportional to 71,350.68, 107,025.25 and 21,428.65

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Solution

The fourth proportional to 71,350.68, 107,025.25 and 21,428.65 is: 32,142.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,350.68 : 107,025.25 = 21,428.65 : x
  2. Step 2: Convert to fraction form
    71,350.68/107,025.25 = 21,428.65/x
  3. Step 3: Cross multiply
    71,350.68x = 107,025.25 × 21,428.65
  4. Step 4: Simplify right side
    71,350.68x = 2,293,406,623.41
  5. Step 5: Solve for x
    x = 2,293,406,623.41/71,350.68
  6. Step 6: Final answer
    x = 32,142.74

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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.