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Finding the Fourth Proportional to 783, 1,170.87 and 585.69

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Solution

The fourth proportional to 783, 1,170.87 and 585.69 is: 875.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    783 : 1,170.87 = 585.69 : x
  2. Step 2: Convert to fraction form
    783/1,170.87 = 585.69/x
  3. Step 3: Cross multiply
    783x = 1,170.87 × 585.69
  4. Step 4: Simplify right side
    783x = 685,766.85
  5. Step 5: Solve for x
    x = 685,766.85/783
  6. Step 6: Final answer
    x = 875.82

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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.