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Finding the Fourth Proportional to 8,640.66, 12,985.37 and 5,131.28

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Solution

The fourth proportional to 8,640.66, 12,985.37 and 5,131.28 is: 7,711.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.66 : 12,985.37 = 5,131.28 : x
  2. Step 2: Convert to fraction form
    8,640.66/12,985.37 = 5,131.28/x
  3. Step 3: Cross multiply
    8,640.66x = 12,985.37 × 5,131.28
  4. Step 4: Simplify right side
    8,640.66x = 66,631,569.37
  5. Step 5: Solve for x
    x = 66,631,569.37/8,640.66
  6. Step 6: Final answer
    x = 7,711.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.