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Finding the Fourth Proportional to 15,422.68, 21,281.70 and 8,708.68

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Solution

The fourth proportional to 15,422.68, 21,281.70 and 8,708.68 is: 12,017.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,422.68 : 21,281.70 = 8,708.68 : x
  2. Step 2: Convert to fraction form
    15,422.68/21,281.70 = 8,708.68/x
  3. Step 3: Cross multiply
    15,422.68x = 21,281.70 × 8,708.68
  4. Step 4: Simplify right side
    15,422.68x = 185,335,515.16
  5. Step 5: Solve for x
    x = 185,335,515.16/15,422.68
  6. Step 6: Final answer
    x = 12,017.08

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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.