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Finding the Fourth Proportional to 8,639.68, 11,916.48 and 5,987.20

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Solution

The fourth proportional to 8,639.68, 11,916.48 and 5,987.20 is: 8,257.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.68 : 11,916.48 = 5,987.20 : x
  2. Step 2: Convert to fraction form
    8,639.68/11,916.48 = 5,987.20/x
  3. Step 3: Cross multiply
    8,639.68x = 11,916.48 × 5,987.20
  4. Step 4: Simplify right side
    8,639.68x = 71,346,349.06
  5. Step 5: Solve for x
    x = 71,346,349.06/8,639.68
  6. Step 6: Final answer
    x = 8,257.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.