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Finding the Fourth Proportional to 620.74, 856.47 and 372.13

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Solution

The fourth proportional to 620.74, 856.47 and 372.13 is: 513.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.74 : 856.47 = 372.13 : x
  2. Step 2: Convert to fraction form
    620.74/856.47 = 372.13/x
  3. Step 3: Cross multiply
    620.74x = 856.47 × 372.13
  4. Step 4: Simplify right side
    620.74x = 318,718.18
  5. Step 5: Solve for x
    x = 318,718.18/620.74
  6. Step 6: Final answer
    x = 513.45

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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.