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Finding the Fourth Proportional to 15,172.65, 20,921.36 and 12,438.90

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Solution

The fourth proportional to 15,172.65, 20,921.36 and 12,438.90 is: 17,151.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,172.65 : 20,921.36 = 12,438.90 : x
  2. Step 2: Convert to fraction form
    15,172.65/20,921.36 = 12,438.90/x
  3. Step 3: Cross multiply
    15,172.65x = 20,921.36 × 12,438.90
  4. Step 4: Simplify right side
    15,172.65x = 260,238,642.71
  5. Step 5: Solve for x
    x = 260,238,642.71/15,172.65
  6. Step 6: Final answer
    x = 17,151.83

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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.