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Finding the Fourth Proportional to 1,479.80, 2,218.32 and 657.63

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Solution

The fourth proportional to 1,479.80, 2,218.32 and 657.63 is: 985.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.80 : 2,218.32 = 657.63 : x
  2. Step 2: Convert to fraction form
    1,479.80/2,218.32 = 657.63/x
  3. Step 3: Cross multiply
    1,479.80x = 2,218.32 × 657.63
  4. Step 4: Simplify right side
    1,479.80x = 1,458,833.78
  5. Step 5: Solve for x
    x = 1,458,833.78/1,479.80
  6. Step 6: Final answer
    x = 985.83

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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.