Home / 12,387.20-18,580.80-7,454.30

Finding the Fourth Proportional to 12,387.20, 18,580.80 and 7,454.30

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Solution

The fourth proportional to 12,387.20, 18,580.80 and 7,454.30 is: 11,181.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,387.20 : 18,580.80 = 7,454.30 : x
  2. Step 2: Convert to fraction form
    12,387.20/18,580.80 = 7,454.30/x
  3. Step 3: Cross multiply
    12,387.20x = 18,580.80 × 7,454.30
  4. Step 4: Simplify right side
    12,387.20x = 138,506,857.44
  5. Step 5: Solve for x
    x = 138,506,857.44/12,387.20
  6. Step 6: Final answer
    x = 11,181.45

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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.