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Finding the Fourth Proportional to 1,164.49, 1,607 and 640.56

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Solution

The fourth proportional to 1,164.49, 1,607 and 640.56 is: 883.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,164.49 : 1,607 = 640.56 : x
  2. Step 2: Convert to fraction form
    1,164.49/1,607 = 640.56/x
  3. Step 3: Cross multiply
    1,164.49x = 1,607 × 640.56
  4. Step 4: Simplify right side
    1,164.49x = 1,029,379.92
  5. Step 5: Solve for x
    x = 1,029,379.92/1,164.49
  6. Step 6: Final answer
    x = 883.97

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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.