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Finding the Fourth Proportional to 783.60, 1,175.88 and 321.60

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Solution

The fourth proportional to 783.60, 1,175.88 and 321.60 is: 482.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.60 : 1,175.88 = 321.60 : x
  2. Step 2: Convert to fraction form
    783.60/1,175.88 = 321.60/x
  3. Step 3: Cross multiply
    783.60x = 1,175.88 × 321.60
  4. Step 4: Simplify right side
    783.60x = 378,163.01
  5. Step 5: Solve for x
    x = 378,163.01/783.60
  6. Step 6: Final answer
    x = 482.60

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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.