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Finding the Fourth Proportional to 558.78, 773.19 and 485.34

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Solution

The fourth proportional to 558.78, 773.19 and 485.34 is: 671.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.78 : 773.19 = 485.34 : x
  2. Step 2: Convert to fraction form
    558.78/773.19 = 485.34/x
  3. Step 3: Cross multiply
    558.78x = 773.19 × 485.34
  4. Step 4: Simplify right side
    558.78x = 375,260.03
  5. Step 5: Solve for x
    x = 375,260.03/558.78
  6. Step 6: Final answer
    x = 671.57

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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.