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Finding the Fourth Proportional to 15,689.28, 21,650.63 and 8,615.28

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Solution

The fourth proportional to 15,689.28, 21,650.63 and 8,615.28 is: 11,888.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.28 : 21,650.63 = 8,615.28 : x
  2. Step 2: Convert to fraction form
    15,689.28/21,650.63 = 8,615.28/x
  3. Step 3: Cross multiply
    15,689.28x = 21,650.63 × 8,615.28
  4. Step 4: Simplify right side
    15,689.28x = 186,526,196.55
  5. Step 5: Solve for x
    x = 186,526,196.55/15,689.28
  6. Step 6: Final answer
    x = 11,888.77

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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.