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Finding the Fourth Proportional to 8,958.34, 13,398.21 and 7,978.07

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Solution

The fourth proportional to 8,958.34, 13,398.21 and 7,978.07 is: 11,932.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,958.34 : 13,398.21 = 7,978.07 : x
  2. Step 2: Convert to fraction form
    8,958.34/13,398.21 = 7,978.07/x
  3. Step 3: Cross multiply
    8,958.34x = 13,398.21 × 7,978.07
  4. Step 4: Simplify right side
    8,958.34x = 106,891,857.25
  5. Step 5: Solve for x
    x = 106,891,857.25/8,958.34
  6. Step 6: Final answer
    x = 11,932.11

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1.5x scale

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.