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Finding the Fourth Proportional to 621, 856.98 and 414.36

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Solution

The fourth proportional to 621, 856.98 and 414.36 is: 571.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    621 : 856.98 = 414.36 : x
  2. Step 2: Convert to fraction form
    621/856.98 = 414.36/x
  3. Step 3: Cross multiply
    621x = 856.98 × 414.36
  4. Step 4: Simplify right side
    621x = 355,098.23
  5. Step 5: Solve for x
    x = 355,098.23/621
  6. Step 6: Final answer
    x = 571.82

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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.