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Finding the Fourth Proportional to 15,717.90, 21,688.92 and 8,643.90

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Solution

The fourth proportional to 15,717.90, 21,688.92 and 8,643.90 is: 11,927.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,717.90 : 21,688.92 = 8,643.90 : x
  2. Step 2: Convert to fraction form
    15,717.90/21,688.92 = 8,643.90/x
  3. Step 3: Cross multiply
    15,717.90x = 21,688.92 × 8,643.90
  4. Step 4: Simplify right side
    15,717.90x = 187,476,855.59
  5. Step 5: Solve for x
    x = 187,476,855.59/15,717.90
  6. Step 6: Final answer
    x = 11,927.60

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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.