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Finding the Fourth Proportional to 876.15, 1,209.56 and 676.56

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Solution

The fourth proportional to 876.15, 1,209.56 and 676.56 is: 934.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.15 : 1,209.56 = 676.56 : x
  2. Step 2: Convert to fraction form
    876.15/1,209.56 = 676.56/x
  3. Step 3: Cross multiply
    876.15x = 1,209.56 × 676.56
  4. Step 4: Simplify right side
    876.15x = 818,336.53
  5. Step 5: Solve for x
    x = 818,336.53/876.15
  6. Step 6: Final answer
    x = 934.01

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1.5x scale

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.