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Finding the Fourth Proportional to 1,049.09, 1,573.49 and 318.72

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Solution

The fourth proportional to 1,049.09, 1,573.49 and 318.72 is: 478.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.09 : 1,573.49 = 318.72 : x
  2. Step 2: Convert to fraction form
    1,049.09/1,573.49 = 318.72/x
  3. Step 3: Cross multiply
    1,049.09x = 1,573.49 × 318.72
  4. Step 4: Simplify right side
    1,049.09x = 501,501.14
  5. Step 5: Solve for x
    x = 501,501.14/1,049.09
  6. Step 6: Final answer
    x = 478.04

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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.