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Finding the Fourth Proportional to 876.38, 1,209.28 and 522.20

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Solution

The fourth proportional to 876.38, 1,209.28 and 522.20 is: 720.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.38 : 1,209.28 = 522.20 : x
  2. Step 2: Convert to fraction form
    876.38/1,209.28 = 522.20/x
  3. Step 3: Cross multiply
    876.38x = 1,209.28 × 522.20
  4. Step 4: Simplify right side
    876.38x = 631,486.02
  5. Step 5: Solve for x
    x = 631,486.02/876.38
  6. Step 6: Final answer
    x = 720.56

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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.