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Finding the Fourth Proportional to 790.69, 1,185.45 and 400.49

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Solution

The fourth proportional to 790.69, 1,185.45 and 400.49 is: 600.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.69 : 1,185.45 = 400.49 : x
  2. Step 2: Convert to fraction form
    790.69/1,185.45 = 400.49/x
  3. Step 3: Cross multiply
    790.69x = 1,185.45 × 400.49
  4. Step 4: Simplify right side
    790.69x = 474,760.87
  5. Step 5: Solve for x
    x = 474,760.87/790.69
  6. Step 6: Final answer
    x = 600.44

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1.5x scale

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.