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Finding the Fourth Proportional to 8,388.40, 12,586.20 and 4,284.40

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Solution

The fourth proportional to 8,388.40, 12,586.20 and 4,284.40 is: 6,428.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,388.40 : 12,586.20 = 4,284.40 : x
  2. Step 2: Convert to fraction form
    8,388.40/12,586.20 = 4,284.40/x
  3. Step 3: Cross multiply
    8,388.40x = 12,586.20 × 4,284.40
  4. Step 4: Simplify right side
    8,388.40x = 53,924,315.28
  5. Step 5: Solve for x
    x = 53,924,315.28/8,388.40
  6. Step 6: Final answer
    x = 6,428.44

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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.