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Finding the Fourth Proportional to 621.18, 856.96 and 385.07

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Solution

The fourth proportional to 621.18, 856.96 and 385.07 is: 531.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.18 : 856.96 = 385.07 : x
  2. Step 2: Convert to fraction form
    621.18/856.96 = 385.07/x
  3. Step 3: Cross multiply
    621.18x = 856.96 × 385.07
  4. Step 4: Simplify right side
    621.18x = 329,983.38
  5. Step 5: Solve for x
    x = 329,983.38/621.18
  6. Step 6: Final answer
    x = 531.22

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1.5x scale

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.