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Finding the Fourth Proportional to 1,133.72, 1,698.28 and 645.36

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Solution

The fourth proportional to 1,133.72, 1,698.28 and 645.36 is: 966.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.72 : 1,698.28 = 645.36 : x
  2. Step 2: Convert to fraction form
    1,133.72/1,698.28 = 645.36/x
  3. Step 3: Cross multiply
    1,133.72x = 1,698.28 × 645.36
  4. Step 4: Simplify right side
    1,133.72x = 1,096,001.98
  5. Step 5: Solve for x
    x = 1,096,001.98/1,133.72
  6. Step 6: Final answer
    x = 966.73

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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.