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Finding the Fourth Proportional to 15,763.13, 21,752.65 and 8,689.53

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Solution

The fourth proportional to 15,763.13, 21,752.65 and 8,689.53 is: 11,991.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,763.13 : 21,752.65 = 8,689.53 : x
  2. Step 2: Convert to fraction form
    15,763.13/21,752.65 = 8,689.53/x
  3. Step 3: Cross multiply
    15,763.13x = 21,752.65 × 8,689.53
  4. Step 4: Simplify right side
    15,763.13x = 189,020,304.75
  5. Step 5: Solve for x
    x = 189,020,304.75/15,763.13
  6. Step 6: Final answer
    x = 11,991.29

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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.