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Finding the Fourth Proportional to 14,478.60, 19,978.20 and 8,515.38

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Solution

The fourth proportional to 14,478.60, 19,978.20 and 8,515.38 is: 11,749.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,478.60 : 19,978.20 = 8,515.38 : x
  2. Step 2: Convert to fraction form
    14,478.60/19,978.20 = 8,515.38/x
  3. Step 3: Cross multiply
    14,478.60x = 19,978.20 × 8,515.38
  4. Step 4: Simplify right side
    14,478.60x = 170,121,964.72
  5. Step 5: Solve for x
    x = 170,121,964.72/14,478.60
  6. Step 6: Final answer
    x = 11,749.89

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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.