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Finding the Fourth Proportional to 616.55, 851.15 and 406.86

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Solution

The fourth proportional to 616.55, 851.15 and 406.86 is: 561.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.55 : 851.15 = 406.86 : x
  2. Step 2: Convert to fraction form
    616.55/851.15 = 406.86/x
  3. Step 3: Cross multiply
    616.55x = 851.15 × 406.86
  4. Step 4: Simplify right side
    616.55x = 346,296.85
  5. Step 5: Solve for x
    x = 346,296.85/616.55
  6. Step 6: Final answer
    x = 561.67

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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.