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Finding the Fourth Proportional to 1,142.40, 1,576.56 and 645.06

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Solution

The fourth proportional to 1,142.40, 1,576.56 and 645.06 is: 890.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.40 : 1,576.56 = 645.06 : x
  2. Step 2: Convert to fraction form
    1,142.40/1,576.56 = 645.06/x
  3. Step 3: Cross multiply
    1,142.40x = 1,576.56 × 645.06
  4. Step 4: Simplify right side
    1,142.40x = 1,016,975.79
  5. Step 5: Solve for x
    x = 1,016,975.79/1,142.40
  6. Step 6: Final answer
    x = 890.21

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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.