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Finding the Fourth Proportional to 780.55, 1,171.22 and 487.98

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Solution

The fourth proportional to 780.55, 1,171.22 and 487.98 is: 732.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.55 : 1,171.22 = 487.98 : x
  2. Step 2: Convert to fraction form
    780.55/1,171.22 = 487.98/x
  3. Step 3: Cross multiply
    780.55x = 1,171.22 × 487.98
  4. Step 4: Simplify right side
    780.55x = 571,531.94
  5. Step 5: Solve for x
    x = 571,531.94/780.55
  6. Step 6: Final answer
    x = 732.22

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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.