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Finding the Fourth Proportional to 15,889.16, 21,926.31 and 8,718.90

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Solution

The fourth proportional to 15,889.16, 21,926.31 and 8,718.90 is: 12,031.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,889.16 : 21,926.31 = 8,718.90 : x
  2. Step 2: Convert to fraction form
    15,889.16/21,926.31 = 8,718.90/x
  3. Step 3: Cross multiply
    15,889.16x = 21,926.31 × 8,718.90
  4. Step 4: Simplify right side
    15,889.16x = 191,173,304.26
  5. Step 5: Solve for x
    x = 191,173,304.26/15,889.16
  6. Step 6: Final answer
    x = 12,031.68

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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.