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Finding the Fourth Proportional to 783.74, 1,175.18 and 388.35

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Solution

The fourth proportional to 783.74, 1,175.18 and 388.35 is: 582.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.74 : 1,175.18 = 388.35 : x
  2. Step 2: Convert to fraction form
    783.74/1,175.18 = 388.35/x
  3. Step 3: Cross multiply
    783.74x = 1,175.18 × 388.35
  4. Step 4: Simplify right side
    783.74x = 456,379.21
  5. Step 5: Solve for x
    x = 456,379.21/783.74
  6. Step 6: Final answer
    x = 582.31

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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.