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Finding the Fourth Proportional to 1,072.42, 1,609.36 and 578.86

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Solution

The fourth proportional to 1,072.42, 1,609.36 and 578.86 is: 868.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.42 : 1,609.36 = 578.86 : x
  2. Step 2: Convert to fraction form
    1,072.42/1,609.36 = 578.86/x
  3. Step 3: Cross multiply
    1,072.42x = 1,609.36 × 578.86
  4. Step 4: Simplify right side
    1,072.42x = 931,594.13
  5. Step 5: Solve for x
    x = 931,594.13/1,072.42
  6. Step 6: Final answer
    x = 868.68

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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.