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Finding the Fourth Proportional to 14,659.88, 20,230.80 and 8,689.28

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Solution

The fourth proportional to 14,659.88, 20,230.80 and 8,689.28 is: 11,991.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,659.88 : 20,230.80 = 8,689.28 : x
  2. Step 2: Convert to fraction form
    14,659.88/20,230.80 = 8,689.28/x
  3. Step 3: Cross multiply
    14,659.88x = 20,230.80 × 8,689.28
  4. Step 4: Simplify right side
    14,659.88x = 175,791,085.82
  5. Step 5: Solve for x
    x = 175,791,085.82/14,659.88
  6. Step 6: Final answer
    x = 11,991.30

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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.