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Finding the Fourth Proportional to 8,870.61, 13,309.07 and 3,939.81

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Solution

The fourth proportional to 8,870.61, 13,309.07 and 3,939.81 is: 5,911.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,870.61 : 13,309.07 = 3,939.81 : x
  2. Step 2: Convert to fraction form
    8,870.61/13,309.07 = 3,939.81/x
  3. Step 3: Cross multiply
    8,870.61x = 13,309.07 × 3,939.81
  4. Step 4: Simplify right side
    8,870.61x = 52,435,187.38
  5. Step 5: Solve for x
    x = 52,435,187.38/8,870.61
  6. Step 6: Final answer
    x = 5,911.11

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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.