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Finding the Fourth Proportional to 876.67, 1,209.39 and 578.23

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Solution

The fourth proportional to 876.67, 1,209.39 and 578.23 is: 797.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.67 : 1,209.39 = 578.23 : x
  2. Step 2: Convert to fraction form
    876.67/1,209.39 = 578.23/x
  3. Step 3: Cross multiply
    876.67x = 1,209.39 × 578.23
  4. Step 4: Simplify right side
    876.67x = 699,305.58
  5. Step 5: Solve for x
    x = 699,305.58/876.67
  6. Step 6: Final answer
    x = 797.68

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Double scale
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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.