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Finding the Fourth Proportional to 876.12, 1,209.02 and 477.78

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Solution

The fourth proportional to 876.12, 1,209.02 and 477.78 is: 659.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.12 : 1,209.02 = 477.78 : x
  2. Step 2: Convert to fraction form
    876.12/1,209.02 = 477.78/x
  3. Step 3: Cross multiply
    876.12x = 1,209.02 × 477.78
  4. Step 4: Simplify right side
    876.12x = 577,645.58
  5. Step 5: Solve for x
    x = 577,645.58/876.12
  6. Step 6: Final answer
    x = 659.32

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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.