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Finding the Fourth Proportional to 15,117.40, 20,863.50 and 8,405.20

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Solution

The fourth proportional to 15,117.40, 20,863.50 and 8,405.20 is: 11,600.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,117.40 : 20,863.50 = 8,405.20 : x
  2. Step 2: Convert to fraction form
    15,117.40/20,863.50 = 8,405.20/x
  3. Step 3: Cross multiply
    15,117.40x = 20,863.50 × 8,405.20
  4. Step 4: Simplify right side
    15,117.40x = 175,361,890.20
  5. Step 5: Solve for x
    x = 175,361,890.20/15,117.40
  6. Step 6: Final answer
    x = 11,600.00

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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.