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Finding the Fourth Proportional to 1,478.55, 2,218.28 and 438.56

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Solution

The fourth proportional to 1,478.55, 2,218.28 and 438.56 is: 657.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.55 : 2,218.28 = 438.56 : x
  2. Step 2: Convert to fraction form
    1,478.55/2,218.28 = 438.56/x
  3. Step 3: Cross multiply
    1,478.55x = 2,218.28 × 438.56
  4. Step 4: Simplify right side
    1,478.55x = 972,837.79
  5. Step 5: Solve for x
    x = 972,837.79/1,478.55
  6. Step 6: Final answer
    x = 657.97

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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.