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Finding the Fourth Proportional to 621.06, 856.47 and 411.06

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Solution

The fourth proportional to 621.06, 856.47 and 411.06 is: 566.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.06 : 856.47 = 411.06 : x
  2. Step 2: Convert to fraction form
    621.06/856.47 = 411.06/x
  3. Step 3: Cross multiply
    621.06x = 856.47 × 411.06
  4. Step 4: Simplify right side
    621.06x = 352,060.56
  5. Step 5: Solve for x
    x = 352,060.56/621.06
  6. Step 6: Final answer
    x = 566.87

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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.