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Finding the Fourth Proportional to 12,312.40, 18,466.20 and 3,990.40

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Solution

The fourth proportional to 12,312.40, 18,466.20 and 3,990.40 is: 5,984.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,312.40 : 18,466.20 = 3,990.40 : x
  2. Step 2: Convert to fraction form
    12,312.40/18,466.20 = 3,990.40/x
  3. Step 3: Cross multiply
    12,312.40x = 18,466.20 × 3,990.40
  4. Step 4: Simplify right side
    12,312.40x = 73,687,524.48
  5. Step 5: Solve for x
    x = 73,687,524.48/12,312.40
  6. Step 6: Final answer
    x = 5,984.82

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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.