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Finding the Fourth Proportional to 15,195.50, 20,970.60 and 8,909.90

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Solution

The fourth proportional to 15,195.50, 20,970.60 and 8,909.90 is: 12,296.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,195.50 : 20,970.60 = 8,909.90 : x
  2. Step 2: Convert to fraction form
    15,195.50/20,970.60 = 8,909.90/x
  3. Step 3: Cross multiply
    15,195.50x = 20,970.60 × 8,909.90
  4. Step 4: Simplify right side
    15,195.50x = 186,845,948.94
  5. Step 5: Solve for x
    x = 186,845,948.94/15,195.50
  6. Step 6: Final answer
    x = 12,296.14

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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.