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Finding the Fourth Proportional to 561.56, 840.32 and 355.19

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Solution

The fourth proportional to 561.56, 840.32 and 355.19 is: 531.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.56 : 840.32 = 355.19 : x
  2. Step 2: Convert to fraction form
    561.56/840.32 = 355.19/x
  3. Step 3: Cross multiply
    561.56x = 840.32 × 355.19
  4. Step 4: Simplify right side
    561.56x = 298,471.48
  5. Step 5: Solve for x
    x = 298,471.48/561.56
  6. Step 6: Final answer
    x = 531.50

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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.