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Finding the Fourth Proportional to 15,203.68, 20,981.52 and 8,489.20

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Solution

The fourth proportional to 15,203.68, 20,981.52 and 8,489.20 is: 11,715.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,203.68 : 20,981.52 = 8,489.20 : x
  2. Step 2: Convert to fraction form
    15,203.68/20,981.52 = 8,489.20/x
  3. Step 3: Cross multiply
    15,203.68x = 20,981.52 × 8,489.20
  4. Step 4: Simplify right side
    15,203.68x = 178,116,319.58
  5. Step 5: Solve for x
    x = 178,116,319.58/15,203.68
  6. Step 6: Final answer
    x = 11,715.34

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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.