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Finding the Fourth Proportional to 920.23, 1,380.79 and 573.48

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Solution

The fourth proportional to 920.23, 1,380.79 and 573.48 is: 860.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.23 : 1,380.79 = 573.48 : x
  2. Step 2: Convert to fraction form
    920.23/1,380.79 = 573.48/x
  3. Step 3: Cross multiply
    920.23x = 1,380.79 × 573.48
  4. Step 4: Simplify right side
    920.23x = 791,856.17
  5. Step 5: Solve for x
    x = 791,856.17/920.23
  6. Step 6: Final answer
    x = 860.50

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.