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Finding the Fourth Proportional to 1,478.96, 2,218.29 and 505.14

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Solution

The fourth proportional to 1,478.96, 2,218.29 and 505.14 is: 757.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.96 : 2,218.29 = 505.14 : x
  2. Step 2: Convert to fraction form
    1,478.96/2,218.29 = 505.14/x
  3. Step 3: Cross multiply
    1,478.96x = 2,218.29 × 505.14
  4. Step 4: Simplify right side
    1,478.96x = 1,120,536.80
  5. Step 5: Solve for x
    x = 1,120,536.80/1,478.96
  6. Step 6: Final answer
    x = 757.65

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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.