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Finding the Fourth Proportional to 561.79, 842.68 and 215.11

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Solution

The fourth proportional to 561.79, 842.68 and 215.11 is: 322.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.79 : 842.68 = 215.11 : x
  2. Step 2: Convert to fraction form
    561.79/842.68 = 215.11/x
  3. Step 3: Cross multiply
    561.79x = 842.68 × 215.11
  4. Step 4: Simplify right side
    561.79x = 181,270.20
  5. Step 5: Solve for x
    x = 181,270.20/561.79
  6. Step 6: Final answer
    x = 322.67

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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.