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Finding the Fourth Proportional to 786.25, 1,178.70 and 298.96

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Solution

The fourth proportional to 786.25, 1,178.70 and 298.96 is: 448.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.25 : 1,178.70 = 298.96 : x
  2. Step 2: Convert to fraction form
    786.25/1,178.70 = 298.96/x
  3. Step 3: Cross multiply
    786.25x = 1,178.70 × 298.96
  4. Step 4: Simplify right side
    786.25x = 352,384.15
  5. Step 5: Solve for x
    x = 352,384.15/786.25
  6. Step 6: Final answer
    x = 448.18

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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.