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Finding the Fourth Proportional to 12,287.70, 18,431.65 and 7,621.29

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Solution

The fourth proportional to 12,287.70, 18,431.65 and 7,621.29 is: 11,432.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,287.70 : 18,431.65 = 7,621.29 : x
  2. Step 2: Convert to fraction form
    12,287.70/18,431.65 = 7,621.29/x
  3. Step 3: Cross multiply
    12,287.70x = 18,431.65 × 7,621.29
  4. Step 4: Simplify right side
    12,287.70x = 140,472,959.36
  5. Step 5: Solve for x
    x = 140,472,959.36/12,287.70
  6. Step 6: Final answer
    x = 11,432.00

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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.