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Finding the Fourth Proportional to 15,428.34, 21,290.95 and 8,713.95

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Solution

The fourth proportional to 15,428.34, 21,290.95 and 8,713.95 is: 12,025.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,428.34 : 21,290.95 = 8,713.95 : x
  2. Step 2: Convert to fraction form
    15,428.34/21,290.95 = 8,713.95/x
  3. Step 3: Cross multiply
    15,428.34x = 21,290.95 × 8,713.95
  4. Step 4: Simplify right side
    15,428.34x = 185,528,204.80
  5. Step 5: Solve for x
    x = 185,528,204.80/15,428.34
  6. Step 6: Final answer
    x = 12,025.16

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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.