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Finding the Fourth Proportional to 15,763.55, 21,754.71 and 8,689.95

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Solution

The fourth proportional to 15,763.55, 21,754.71 and 8,689.95 is: 11,992.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,763.55 : 21,754.71 = 8,689.95 : x
  2. Step 2: Convert to fraction form
    15,763.55/21,754.71 = 8,689.95/x
  3. Step 3: Cross multiply
    15,763.55x = 21,754.71 × 8,689.95
  4. Step 4: Simplify right side
    15,763.55x = 189,047,342.16
  5. Step 5: Solve for x
    x = 189,047,342.16/15,763.55
  6. Step 6: Final answer
    x = 11,992.69

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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.