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Finding the Fourth Proportional to 621.15, 856.94 and 384.93

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Solution

The fourth proportional to 621.15, 856.94 and 384.93 is: 531.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.15 : 856.94 = 384.93 : x
  2. Step 2: Convert to fraction form
    621.15/856.94 = 384.93/x
  3. Step 3: Cross multiply
    621.15x = 856.94 × 384.93
  4. Step 4: Simplify right side
    621.15x = 329,859.99
  5. Step 5: Solve for x
    x = 329,859.99/621.15
  6. Step 6: Final answer
    x = 531.05

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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.