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Finding the Fourth Proportional to 790.55, 1,090.56 and 614.69

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Solution

The fourth proportional to 790.55, 1,090.56 and 614.69 is: 847.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.55 : 1,090.56 = 614.69 : x
  2. Step 2: Convert to fraction form
    790.55/1,090.56 = 614.69/x
  3. Step 3: Cross multiply
    790.55x = 1,090.56 × 614.69
  4. Step 4: Simplify right side
    790.55x = 670,350.87
  5. Step 5: Solve for x
    x = 670,350.87/790.55
  6. Step 6: Final answer
    x = 847.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.