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Finding the Fourth Proportional to 1,142.43, 1,576.63 and 645.15

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Solution

The fourth proportional to 1,142.43, 1,576.63 and 645.15 is: 890.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.43 : 1,576.63 = 645.15 : x
  2. Step 2: Convert to fraction form
    1,142.43/1,576.63 = 645.15/x
  3. Step 3: Cross multiply
    1,142.43x = 1,576.63 × 645.15
  4. Step 4: Simplify right side
    1,142.43x = 1,017,162.84
  5. Step 5: Solve for x
    x = 1,017,162.84/1,142.43
  6. Step 6: Final answer
    x = 890.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.