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Finding the Fourth Proportional to 783.29, 1,175.10 and 393.55

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Solution

The fourth proportional to 783.29, 1,175.10 and 393.55 is: 590.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.29 : 1,175.10 = 393.55 : x
  2. Step 2: Convert to fraction form
    783.29/1,175.10 = 393.55/x
  3. Step 3: Cross multiply
    783.29x = 1,175.10 × 393.55
  4. Step 4: Simplify right side
    783.29x = 462,460.61
  5. Step 5: Solve for x
    x = 462,460.61/783.29
  6. Step 6: Final answer
    x = 590.41

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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.