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Finding the Fourth Proportional to 15,763.71, 21,752.76 and 8,690.13

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Solution

The fourth proportional to 15,763.71, 21,752.76 and 8,690.13 is: 11,991.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,763.71 : 21,752.76 = 8,690.13 : x
  2. Step 2: Convert to fraction form
    15,763.71/21,752.76 = 8,690.13/x
  3. Step 3: Cross multiply
    15,763.71x = 21,752.76 × 8,690.13
  4. Step 4: Simplify right side
    15,763.71x = 189,034,312.26
  5. Step 5: Solve for x
    x = 189,034,312.26/15,763.71
  6. Step 6: Final answer
    x = 11,991.74

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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.