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Finding the Fourth Proportional to 1,088.22, 1,501.79 and 789.61

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Solution

The fourth proportional to 1,088.22, 1,501.79 and 789.61 is: 1,089.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,088.22 : 1,501.79 = 789.61 : x
  2. Step 2: Convert to fraction form
    1,088.22/1,501.79 = 789.61/x
  3. Step 3: Cross multiply
    1,088.22x = 1,501.79 × 789.61
  4. Step 4: Simplify right side
    1,088.22x = 1,185,828.40
  5. Step 5: Solve for x
    x = 1,185,828.40/1,088.22
  6. Step 6: Final answer
    x = 1,089.70

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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.