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Finding the Fourth Proportional to 8,591.12, 12,945.21 and 7,065.31

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Solution

The fourth proportional to 8,591.12, 12,945.21 and 7,065.31 is: 10,646.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,591.12 : 12,945.21 = 7,065.31 : x
  2. Step 2: Convert to fraction form
    8,591.12/12,945.21 = 7,065.31/x
  3. Step 3: Cross multiply
    8,591.12x = 12,945.21 × 7,065.31
  4. Step 4: Simplify right side
    8,591.12x = 91,461,889.30
  5. Step 5: Solve for x
    x = 91,461,889.30/8,591.12
  6. Step 6: Final answer
    x = 10,646.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.