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Finding the Fourth Proportional to 7,911.50, 10,918.06 and 5,121.86

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Solution

The fourth proportional to 7,911.50, 10,918.06 and 5,121.86 is: 7,068.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.50 : 10,918.06 = 5,121.86 : x
  2. Step 2: Convert to fraction form
    7,911.50/10,918.06 = 5,121.86/x
  3. Step 3: Cross multiply
    7,911.50x = 10,918.06 × 5,121.86
  4. Step 4: Simplify right side
    7,911.50x = 55,920,774.79
  5. Step 5: Solve for x
    x = 55,920,774.79/7,911.50
  6. Step 6: Final answer
    x = 7,068.29

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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.