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Finding the Fourth Proportional to 876.83, 1,209.47 and 640.44

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Solution

The fourth proportional to 876.83, 1,209.47 and 640.44 is: 883.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.83 : 1,209.47 = 640.44 : x
  2. Step 2: Convert to fraction form
    876.83/1,209.47 = 640.44/x
  3. Step 3: Cross multiply
    876.83x = 1,209.47 × 640.44
  4. Step 4: Simplify right side
    876.83x = 774,589.76
  5. Step 5: Solve for x
    x = 774,589.76/876.83
  6. Step 6: Final answer
    x = 883.40

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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.