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Finding the Fourth Proportional to 841.80, 1,262.40 and 321.89

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Solution

The fourth proportional to 841.80, 1,262.40 and 321.89 is: 482.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.80 : 1,262.40 = 321.89 : x
  2. Step 2: Convert to fraction form
    841.80/1,262.40 = 321.89/x
  3. Step 3: Cross multiply
    841.80x = 1,262.40 × 321.89
  4. Step 4: Simplify right side
    841.80x = 406,346.42
  5. Step 5: Solve for x
    x = 406,346.42/841.80
  6. Step 6: Final answer
    x = 482.71

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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.