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Finding the Fourth Proportional to 15,159.25, 20,921.18 and 8,871.63

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Solution

The fourth proportional to 15,159.25, 20,921.18 and 8,871.63 is: 12,243.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.25 : 20,921.18 = 8,871.63 : x
  2. Step 2: Convert to fraction form
    15,159.25/20,921.18 = 8,871.63/x
  3. Step 3: Cross multiply
    15,159.25x = 20,921.18 × 8,871.63
  4. Step 4: Simplify right side
    15,159.25x = 185,604,968.12
  5. Step 5: Solve for x
    x = 185,604,968.12/15,159.25
  6. Step 6: Final answer
    x = 12,243.68

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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.