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Finding the Fourth Proportional to 884.47, 1,220.21 and 553.12

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Solution

The fourth proportional to 884.47, 1,220.21 and 553.12 is: 763.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.47 : 1,220.21 = 553.12 : x
  2. Step 2: Convert to fraction form
    884.47/1,220.21 = 553.12/x
  3. Step 3: Cross multiply
    884.47x = 1,220.21 × 553.12
  4. Step 4: Simplify right side
    884.47x = 674,920.21
  5. Step 5: Solve for x
    x = 674,920.21/884.47
  6. Step 6: Final answer
    x = 763.08

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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.