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Finding the Fourth Proportional to 860.91, 1,187.52 and 750.65

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Solution

The fourth proportional to 860.91, 1,187.52 and 750.65 is: 1,035.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.91 : 1,187.52 = 750.65 : x
  2. Step 2: Convert to fraction form
    860.91/1,187.52 = 750.65/x
  3. Step 3: Cross multiply
    860.91x = 1,187.52 × 750.65
  4. Step 4: Simplify right side
    860.91x = 891,413.22
  5. Step 5: Solve for x
    x = 891,413.22/860.91
  6. Step 6: Final answer
    x = 1,035.43

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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.