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Finding the Fourth Proportional to 783.61, 1,175.57 and 235.80

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Solution

The fourth proportional to 783.61, 1,175.57 and 235.80 is: 353.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.61 : 1,175.57 = 235.80 : x
  2. Step 2: Convert to fraction form
    783.61/1,175.57 = 235.80/x
  3. Step 3: Cross multiply
    783.61x = 1,175.57 × 235.80
  4. Step 4: Simplify right side
    783.61x = 277,199.41
  5. Step 5: Solve for x
    x = 277,199.41/783.61
  6. Step 6: Final answer
    x = 353.75

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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.