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Finding the Fourth Proportional to 621.95, 857.38 and 434.85

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Solution

The fourth proportional to 621.95, 857.38 and 434.85 is: 599.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.95 : 857.38 = 434.85 : x
  2. Step 2: Convert to fraction form
    621.95/857.38 = 434.85/x
  3. Step 3: Cross multiply
    621.95x = 857.38 × 434.85
  4. Step 4: Simplify right side
    621.95x = 372,831.66
  5. Step 5: Solve for x
    x = 372,831.66/621.95
  6. Step 6: Final answer
    x = 599.46

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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.