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Finding the Fourth Proportional to 1,045.67, 1,568.21 and 315.25

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Solution

The fourth proportional to 1,045.67, 1,568.21 and 315.25 is: 472.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.67 : 1,568.21 = 315.25 : x
  2. Step 2: Convert to fraction form
    1,045.67/1,568.21 = 315.25/x
  3. Step 3: Cross multiply
    1,045.67x = 1,568.21 × 315.25
  4. Step 4: Simplify right side
    1,045.67x = 494,372.71
  5. Step 5: Solve for x
    x = 494,372.71/1,045.67
  6. Step 6: Final answer
    x = 472.78

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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.