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Finding the Fourth Proportional to 783.96, 1,083.42 and 587.40

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Solution

The fourth proportional to 783.96, 1,083.42 and 587.40 is: 811.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.96 : 1,083.42 = 587.40 : x
  2. Step 2: Convert to fraction form
    783.96/1,083.42 = 587.40/x
  3. Step 3: Cross multiply
    783.96x = 1,083.42 × 587.40
  4. Step 4: Simplify right side
    783.96x = 636,400.91
  5. Step 5: Solve for x
    x = 636,400.91/783.96
  6. Step 6: Final answer
    x = 811.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.