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Finding the Fourth Proportional to 621.02, 856.86 and 372.36

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Solution

The fourth proportional to 621.02, 856.86 and 372.36 is: 513.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.02 : 856.86 = 372.36 : x
  2. Step 2: Convert to fraction form
    621.02/856.86 = 372.36/x
  3. Step 3: Cross multiply
    621.02x = 856.86 × 372.36
  4. Step 4: Simplify right side
    621.02x = 319,060.39
  5. Step 5: Solve for x
    x = 319,060.39/621.02
  6. Step 6: Final answer
    x = 513.77

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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.