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Finding the Fourth Proportional to 8,665.95, 11,962.08 and 5,129.16

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Solution

The fourth proportional to 8,665.95, 11,962.08 and 5,129.16 is: 7,080.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,665.95 : 11,962.08 = 5,129.16 : x
  2. Step 2: Convert to fraction form
    8,665.95/11,962.08 = 5,129.16/x
  3. Step 3: Cross multiply
    8,665.95x = 11,962.08 × 5,129.16
  4. Step 4: Simplify right side
    8,665.95x = 61,355,377.40
  5. Step 5: Solve for x
    x = 61,355,377.40/8,665.95
  6. Step 6: Final answer
    x = 7,080.05

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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.