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Finding the Fourth Proportional to 790.92, 1,186.78 and 357.98

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Solution

The fourth proportional to 790.92, 1,186.78 and 357.98 is: 537.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.92 : 1,186.78 = 357.98 : x
  2. Step 2: Convert to fraction form
    790.92/1,186.78 = 357.98/x
  3. Step 3: Cross multiply
    790.92x = 1,186.78 × 357.98
  4. Step 4: Simplify right side
    790.92x = 424,843.50
  5. Step 5: Solve for x
    x = 424,843.50/790.92
  6. Step 6: Final answer
    x = 537.15

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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.