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Finding the Fourth Proportional to 8,672.88, 11,971.68 and 5,136.12

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Solution

The fourth proportional to 8,672.88, 11,971.68 and 5,136.12 is: 7,089.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,672.88 : 11,971.68 = 5,136.12 : x
  2. Step 2: Convert to fraction form
    8,672.88/11,971.68 = 5,136.12/x
  3. Step 3: Cross multiply
    8,672.88x = 11,971.68 × 5,136.12
  4. Step 4: Simplify right side
    8,672.88x = 61,487,985.08
  5. Step 5: Solve for x
    x = 61,487,985.08/8,672.88
  6. Step 6: Final answer
    x = 7,089.68

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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.