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Finding the Fourth Proportional to 616.50, 850.78 and 340.50

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Solution

The fourth proportional to 616.50, 850.78 and 340.50 is: 469.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.50 : 850.78 = 340.50 : x
  2. Step 2: Convert to fraction form
    616.50/850.78 = 340.50/x
  3. Step 3: Cross multiply
    616.50x = 850.78 × 340.50
  4. Step 4: Simplify right side
    616.50x = 289,690.59
  5. Step 5: Solve for x
    x = 289,690.59/616.50
  6. Step 6: Final answer
    x = 469.90

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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.