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Finding the Fourth Proportional to 7,911.31, 10,917.28 and 4,326.21

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Solution

The fourth proportional to 7,911.31, 10,917.28 and 4,326.21 is: 5,969.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.31 : 10,917.28 = 4,326.21 : x
  2. Step 2: Convert to fraction form
    7,911.31/10,917.28 = 4,326.21/x
  3. Step 3: Cross multiply
    7,911.31x = 10,917.28 × 4,326.21
  4. Step 4: Simplify right side
    7,911.31x = 47,230,445.91
  5. Step 5: Solve for x
    x = 47,230,445.91/7,911.31
  6. Step 6: Final answer
    x = 5,969.99

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1.5x scale

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.