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Finding the Fourth Proportional to 15,265, 21,065.70 and 8,981.20

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Solution

The fourth proportional to 15,265, 21,065.70 and 8,981.20 is: 12,394.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,265 : 21,065.70 = 8,981.20 : x
  2. Step 2: Convert to fraction form
    15,265/21,065.70 = 8,981.20/x
  3. Step 3: Cross multiply
    15,265x = 21,065.70 × 8,981.20
  4. Step 4: Simplify right side
    15,265x = 189,195,264.84
  5. Step 5: Solve for x
    x = 189,195,264.84/15,265
  6. Step 6: Final answer
    x = 12,394.06

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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.