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Finding the Fourth Proportional to 8,420.16, 12,679.20 and 6,244.32

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Solution

The fourth proportional to 8,420.16, 12,679.20 and 6,244.32 is: 9,402.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420.16 : 12,679.20 = 6,244.32 : x
  2. Step 2: Convert to fraction form
    8,420.16/12,679.20 = 6,244.32/x
  3. Step 3: Cross multiply
    8,420.16x = 12,679.20 × 6,244.32
  4. Step 4: Simplify right side
    8,420.16x = 79,172,982.14
  5. Step 5: Solve for x
    x = 79,172,982.14/8,420.16
  6. Step 6: Final answer
    x = 9,402.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.