Home / 8,640.66-12,985.36-5,131.26

Finding the Fourth Proportional to 8,640.66, 12,985.36 and 5,131.26

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Solution

The fourth proportional to 8,640.66, 12,985.36 and 5,131.26 is: 7,711.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.66 : 12,985.36 = 5,131.26 : x
  2. Step 2: Convert to fraction form
    8,640.66/12,985.36 = 5,131.26/x
  3. Step 3: Cross multiply
    8,640.66x = 12,985.36 × 5,131.26
  4. Step 4: Simplify right side
    8,640.66x = 66,631,258.35
  5. Step 5: Solve for x
    x = 66,631,258.35/8,640.66
  6. Step 6: Final answer
    x = 7,711.36

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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.