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Finding the Fourth Proportional to 15,211.40, 20,978.61 and 14,325.68

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Solution

The fourth proportional to 15,211.40, 20,978.61 and 14,325.68 is: 19,757.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,211.40 : 20,978.61 = 14,325.68 : x
  2. Step 2: Convert to fraction form
    15,211.40/20,978.61 = 14,325.68/x
  3. Step 3: Cross multiply
    15,211.40x = 20,978.61 × 14,325.68
  4. Step 4: Simplify right side
    15,211.40x = 300,532,853.70
  5. Step 5: Solve for x
    x = 300,532,853.70/15,211.40
  6. Step 6: Final answer
    x = 19,757.08

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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.