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Finding the Fourth Proportional to 785.39, 1,177.79 and 258.18

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Solution

The fourth proportional to 785.39, 1,177.79 and 258.18 is: 387.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.39 : 1,177.79 = 258.18 : x
  2. Step 2: Convert to fraction form
    785.39/1,177.79 = 258.18/x
  3. Step 3: Cross multiply
    785.39x = 1,177.79 × 258.18
  4. Step 4: Simplify right side
    785.39x = 304,077.08
  5. Step 5: Solve for x
    x = 304,077.08/785.39
  6. Step 6: Final answer
    x = 387.17

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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.