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Finding the Fourth Proportional to 1,174.31, 1,620.65 and 650.45

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Solution

The fourth proportional to 1,174.31, 1,620.65 and 650.45 is: 897.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.31 : 1,620.65 = 650.45 : x
  2. Step 2: Convert to fraction form
    1,174.31/1,620.65 = 650.45/x
  3. Step 3: Cross multiply
    1,174.31x = 1,620.65 × 650.45
  4. Step 4: Simplify right side
    1,174.31x = 1,054,151.79
  5. Step 5: Solve for x
    x = 1,054,151.79/1,174.31
  6. Step 6: Final answer
    x = 897.68

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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.