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Finding the Fourth Proportional to 620.52, 856.30 and 371.70

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Solution

The fourth proportional to 620.52, 856.30 and 371.70 is: 512.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.52 : 856.30 = 371.70 : x
  2. Step 2: Convert to fraction form
    620.52/856.30 = 371.70/x
  3. Step 3: Cross multiply
    620.52x = 856.30 × 371.70
  4. Step 4: Simplify right side
    620.52x = 318,280.57
  5. Step 5: Solve for x
    x = 318,280.57/620.52
  6. Step 6: Final answer
    x = 512.93

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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.