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Finding the Fourth Proportional to 913.77, 1,258.47 and 789.39

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Solution

The fourth proportional to 913.77, 1,258.47 and 789.39 is: 1,087.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.77 : 1,258.47 = 789.39 : x
  2. Step 2: Convert to fraction form
    913.77/1,258.47 = 789.39/x
  3. Step 3: Cross multiply
    913.77x = 1,258.47 × 789.39
  4. Step 4: Simplify right side
    913.77x = 993,423.63
  5. Step 5: Solve for x
    x = 993,423.63/913.77
  6. Step 6: Final answer
    x = 1,087.17

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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.