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Finding the Fourth Proportional to 15,239.78, 20,984.17 and 13,340.74

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Solution

The fourth proportional to 15,239.78, 20,984.17 and 13,340.74 is: 18,369.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,239.78 : 20,984.17 = 13,340.74 : x
  2. Step 2: Convert to fraction form
    15,239.78/20,984.17 = 13,340.74/x
  3. Step 3: Cross multiply
    15,239.78x = 20,984.17 × 13,340.74
  4. Step 4: Simplify right side
    15,239.78x = 279,944,184.46
  5. Step 5: Solve for x
    x = 279,944,184.46/15,239.78
  6. Step 6: Final answer
    x = 18,369.31

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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.