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Finding the Fourth Proportional to 1,142.41, 1,576.50 and 645.06

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Solution

The fourth proportional to 1,142.41, 1,576.50 and 645.06 is: 890.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.41 : 1,576.50 = 645.06 : x
  2. Step 2: Convert to fraction form
    1,142.41/1,576.50 = 645.06/x
  3. Step 3: Cross multiply
    1,142.41x = 1,576.50 × 645.06
  4. Step 4: Simplify right side
    1,142.41x = 1,016,937.09
  5. Step 5: Solve for x
    x = 1,016,937.09/1,142.41
  6. Step 6: Final answer
    x = 890.17

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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.