Home / 12,001.78-18,002.40-5,426.20

Finding the Fourth Proportional to 12,001.78, 18,002.40 and 5,426.20

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Solution

The fourth proportional to 12,001.78, 18,002.40 and 5,426.20 is: 8,139.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,001.78 : 18,002.40 = 5,426.20 : x
  2. Step 2: Convert to fraction form
    12,001.78/18,002.40 = 5,426.20/x
  3. Step 3: Cross multiply
    12,001.78x = 18,002.40 × 5,426.20
  4. Step 4: Simplify right side
    12,001.78x = 97,684,622.88
  5. Step 5: Solve for x
    x = 97,684,622.88/12,001.78
  6. Step 6: Final answer
    x = 8,139.18

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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.