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Finding the Fourth Proportional to 561.31, 842.32 and 214.67

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Solution

The fourth proportional to 561.31, 842.32 and 214.67 is: 322.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.31 : 842.32 = 214.67 : x
  2. Step 2: Convert to fraction form
    561.31/842.32 = 214.67/x
  3. Step 3: Cross multiply
    561.31x = 842.32 × 214.67
  4. Step 4: Simplify right side
    561.31x = 180,823.21
  5. Step 5: Solve for x
    x = 180,823.21/561.31
  6. Step 6: Final answer
    x = 322.15

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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.