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Finding the Fourth Proportional to 561.66, 842.19 and 214.89

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Solution

The fourth proportional to 561.66, 842.19 and 214.89 is: 322.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.66 : 842.19 = 214.89 : x
  2. Step 2: Convert to fraction form
    561.66/842.19 = 214.89/x
  3. Step 3: Cross multiply
    561.66x = 842.19 × 214.89
  4. Step 4: Simplify right side
    561.66x = 180,978.21
  5. Step 5: Solve for x
    x = 180,978.21/561.66
  6. Step 6: Final answer
    x = 322.22

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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.