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Finding the Fourth Proportional to 8,515.61, 11,751.89 and 5,156.53

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Solution

The fourth proportional to 8,515.61, 11,751.89 and 5,156.53 is: 7,116.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,515.61 : 11,751.89 = 5,156.53 : x
  2. Step 2: Convert to fraction form
    8,515.61/11,751.89 = 5,156.53/x
  3. Step 3: Cross multiply
    8,515.61x = 11,751.89 × 5,156.53
  4. Step 4: Simplify right side
    8,515.61x = 60,598,962.25
  5. Step 5: Solve for x
    x = 60,598,962.25/8,515.61
  6. Step 6: Final answer
    x = 7,116.22

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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.