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Finding the Fourth Proportional to 871.40, 1,307.10 and 222.11

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Solution

The fourth proportional to 871.40, 1,307.10 and 222.11 is: 333.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.40 : 1,307.10 = 222.11 : x
  2. Step 2: Convert to fraction form
    871.40/1,307.10 = 222.11/x
  3. Step 3: Cross multiply
    871.40x = 1,307.10 × 222.11
  4. Step 4: Simplify right side
    871.40x = 290,313.45
  5. Step 5: Solve for x
    x = 290,313.45/871.40
  6. Step 6: Final answer
    x = 333.16

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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.