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Finding the Fourth Proportional to 876.31, 1,209.57 and 522.49

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Solution

The fourth proportional to 876.31, 1,209.57 and 522.49 is: 721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.31 : 1,209.57 = 522.49 : x
  2. Step 2: Convert to fraction form
    876.31/1,209.57 = 522.49/x
  3. Step 3: Cross multiply
    876.31x = 1,209.57 × 522.49
  4. Step 4: Simplify right side
    876.31x = 631,988.23
  5. Step 5: Solve for x
    x = 631,988.23/876.31
  6. Step 6: Final answer
    x = 721.20

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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.