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Finding the Fourth Proportional to 15,615.95, 21,549.92 and 8,901.86

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Solution

The fourth proportional to 15,615.95, 21,549.92 and 8,901.86 is: 12,284.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,615.95 : 21,549.92 = 8,901.86 : x
  2. Step 2: Convert to fraction form
    15,615.95/21,549.92 = 8,901.86/x
  3. Step 3: Cross multiply
    15,615.95x = 21,549.92 × 8,901.86
  4. Step 4: Simplify right side
    15,615.95x = 191,834,218.59
  5. Step 5: Solve for x
    x = 191,834,218.59/15,615.95
  6. Step 6: Final answer
    x = 12,284.51

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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.