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Finding the Fourth Proportional to 920.20, 1,269.78 and 527.20

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Solution

The fourth proportional to 920.20, 1,269.78 and 527.20 is: 727.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.20 : 1,269.78 = 527.20 : x
  2. Step 2: Convert to fraction form
    920.20/1,269.78 = 527.20/x
  3. Step 3: Cross multiply
    920.20x = 1,269.78 × 527.20
  4. Step 4: Simplify right side
    920.20x = 669,428.02
  5. Step 5: Solve for x
    x = 669,428.02/920.20
  6. Step 6: Final answer
    x = 727.48

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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.