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Finding the Fourth Proportional to 7,955.40, 10,978.80 and 4,418.61

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Solution

The fourth proportional to 7,955.40, 10,978.80 and 4,418.61 is: 6,097.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,955.40 : 10,978.80 = 4,418.61 : x
  2. Step 2: Convert to fraction form
    7,955.40/10,978.80 = 4,418.61/x
  3. Step 3: Cross multiply
    7,955.40x = 10,978.80 × 4,418.61
  4. Step 4: Simplify right side
    7,955.40x = 48,511,085.99
  5. Step 5: Solve for x
    x = 48,511,085.99/7,955.40
  6. Step 6: Final answer
    x = 6,097.88

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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.