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Finding the Fourth Proportional to 15,115.80, 20,856.60 and 9,148.80

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Solution

The fourth proportional to 15,115.80, 20,856.60 and 9,148.80 is: 12,623.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.80 : 20,856.60 = 9,148.80 : x
  2. Step 2: Convert to fraction form
    15,115.80/20,856.60 = 9,148.80/x
  3. Step 3: Cross multiply
    15,115.80x = 20,856.60 × 9,148.80
  4. Step 4: Simplify right side
    15,115.80x = 190,812,862.08
  5. Step 5: Solve for x
    x = 190,812,862.08/15,115.80
  6. Step 6: Final answer
    x = 12,623.40

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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.