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Finding the Fourth Proportional to 621.50, 857.33 and 400.67

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Solution

The fourth proportional to 621.50, 857.33 and 400.67 is: 552.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.50 : 857.33 = 400.67 : x
  2. Step 2: Convert to fraction form
    621.50/857.33 = 400.67/x
  3. Step 3: Cross multiply
    621.50x = 857.33 × 400.67
  4. Step 4: Simplify right side
    621.50x = 343,500.12
  5. Step 5: Solve for x
    x = 343,500.12/621.50
  6. Step 6: Final answer
    x = 552.70

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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.