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Finding the Fourth Proportional to 876.59, 1,208.80 and 640.57

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Solution

The fourth proportional to 876.59, 1,208.80 and 640.57 is: 883.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.59 : 1,208.80 = 640.57 : x
  2. Step 2: Convert to fraction form
    876.59/1,208.80 = 640.57/x
  3. Step 3: Cross multiply
    876.59x = 1,208.80 × 640.57
  4. Step 4: Simplify right side
    876.59x = 774,321.02
  5. Step 5: Solve for x
    x = 774,321.02/876.59
  6. Step 6: Final answer
    x = 883.33

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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.