Home / 12,225.60-18,280.80-9,115.20

Finding the Fourth Proportional to 12,225.60, 18,280.80 and 9,115.20

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Solution

The fourth proportional to 12,225.60, 18,280.80 and 9,115.20 is: 13,629.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,225.60 : 18,280.80 = 9,115.20 : x
  2. Step 2: Convert to fraction form
    12,225.60/18,280.80 = 9,115.20/x
  3. Step 3: Cross multiply
    12,225.60x = 18,280.80 × 9,115.20
  4. Step 4: Simplify right side
    12,225.60x = 166,633,148.16
  5. Step 5: Solve for x
    x = 166,633,148.16/12,225.60
  6. Step 6: Final answer
    x = 13,629.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.