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Finding the Fourth Proportional to 8,639.06, 11,918.85 and 5,656.53

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Solution

The fourth proportional to 8,639.06, 11,918.85 and 5,656.53 is: 7,804.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.06 : 11,918.85 = 5,656.53 : x
  2. Step 2: Convert to fraction form
    8,639.06/11,918.85 = 5,656.53/x
  3. Step 3: Cross multiply
    8,639.06x = 11,918.85 × 5,656.53
  4. Step 4: Simplify right side
    8,639.06x = 67,419,356.07
  5. Step 5: Solve for x
    x = 67,419,356.07/8,639.06
  6. Step 6: Final answer
    x = 7,804.02

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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.