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Finding the Fourth Proportional to 561.49, 842.20 and 214.99

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Solution

The fourth proportional to 561.49, 842.20 and 214.99 is: 322.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.49 : 842.20 = 214.99 : x
  2. Step 2: Convert to fraction form
    561.49/842.20 = 214.99/x
  3. Step 3: Cross multiply
    561.49x = 842.20 × 214.99
  4. Step 4: Simplify right side
    561.49x = 181,060.23
  5. Step 5: Solve for x
    x = 181,060.23/561.49
  6. Step 6: Final answer
    x = 322.47

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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.