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Finding the Fourth Proportional to 561.95, 842.49 and 215.18

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Solution

The fourth proportional to 561.95, 842.49 and 215.18 is: 322.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.95 : 842.49 = 215.18 : x
  2. Step 2: Convert to fraction form
    561.95/842.49 = 215.18/x
  3. Step 3: Cross multiply
    561.95x = 842.49 × 215.18
  4. Step 4: Simplify right side
    561.95x = 181,282.79
  5. Step 5: Solve for x
    x = 181,282.79/561.95
  6. Step 6: Final answer
    x = 322.60

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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.