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Finding the Fourth Proportional to 561.45, 842.13 and 215.02

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Solution

The fourth proportional to 561.45, 842.13 and 215.02 is: 322.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.45 : 842.13 = 215.02 : x
  2. Step 2: Convert to fraction form
    561.45/842.13 = 215.02/x
  3. Step 3: Cross multiply
    561.45x = 842.13 × 215.02
  4. Step 4: Simplify right side
    561.45x = 181,072.69
  5. Step 5: Solve for x
    x = 181,072.69/561.45
  6. Step 6: Final answer
    x = 322.51

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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.