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Finding the Fourth Proportional to 870.96, 1,306.43 and 221.70

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Solution

The fourth proportional to 870.96, 1,306.43 and 221.70 is: 332.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.96 : 1,306.43 = 221.70 : x
  2. Step 2: Convert to fraction form
    870.96/1,306.43 = 221.70/x
  3. Step 3: Cross multiply
    870.96x = 1,306.43 × 221.70
  4. Step 4: Simplify right side
    870.96x = 289,632.80
  5. Step 5: Solve for x
    x = 289,632.80/870.96
  6. Step 6: Final answer
    x = 332.54

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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.