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Finding the Fourth Proportional to 786.25, 1,178.70 and 395.93

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Solution

The fourth proportional to 786.25, 1,178.70 and 395.93 is: 593.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.25 : 1,178.70 = 395.93 : x
  2. Step 2: Convert to fraction form
    786.25/1,178.70 = 395.93/x
  3. Step 3: Cross multiply
    786.25x = 1,178.70 × 395.93
  4. Step 4: Simplify right side
    786.25x = 466,678.08
  5. Step 5: Solve for x
    x = 466,678.08/786.25
  6. Step 6: Final answer
    x = 593.55

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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.