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Finding the Fourth Proportional to 790.60, 1,185.87 and 426.10

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Solution

The fourth proportional to 790.60, 1,185.87 and 426.10 is: 639.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.60 : 1,185.87 = 426.10 : x
  2. Step 2: Convert to fraction form
    790.60/1,185.87 = 426.10/x
  3. Step 3: Cross multiply
    790.60x = 1,185.87 × 426.10
  4. Step 4: Simplify right side
    790.60x = 505,299.21
  5. Step 5: Solve for x
    x = 505,299.21/790.60
  6. Step 6: Final answer
    x = 639.13

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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.