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Finding the Fourth Proportional to 1,478.99, 2,218.80 and 505.28

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Solution

The fourth proportional to 1,478.99, 2,218.80 and 505.28 is: 758.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.99 : 2,218.80 = 505.28 : x
  2. Step 2: Convert to fraction form
    1,478.99/2,218.80 = 505.28/x
  3. Step 3: Cross multiply
    1,478.99x = 2,218.80 × 505.28
  4. Step 4: Simplify right side
    1,478.99x = 1,121,115.26
  5. Step 5: Solve for x
    x = 1,121,115.26/1,478.99
  6. Step 6: Final answer
    x = 758.03

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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.