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Finding the Fourth Proportional to 1,087.77, 1,501.20 and 789.18

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Solution

The fourth proportional to 1,087.77, 1,501.20 and 789.18 is: 1,089.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.77 : 1,501.20 = 789.18 : x
  2. Step 2: Convert to fraction form
    1,087.77/1,501.20 = 789.18/x
  3. Step 3: Cross multiply
    1,087.77x = 1,501.20 × 789.18
  4. Step 4: Simplify right side
    1,087.77x = 1,184,717.02
  5. Step 5: Solve for x
    x = 1,184,717.02/1,087.77
  6. Step 6: Final answer
    x = 1,089.12

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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.