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Finding the Fourth Proportional to 621.12, 856.44 and 424.56

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Solution

The fourth proportional to 621.12, 856.44 and 424.56 is: 585.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.12 : 856.44 = 424.56 : x
  2. Step 2: Convert to fraction form
    621.12/856.44 = 424.56/x
  3. Step 3: Cross multiply
    621.12x = 856.44 × 424.56
  4. Step 4: Simplify right side
    621.12x = 363,610.17
  5. Step 5: Solve for x
    x = 363,610.17/621.12
  6. Step 6: Final answer
    x = 585.41

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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.