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Finding the Fourth Proportional to 974.29, 1,345.13 and 620.41

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Solution

The fourth proportional to 974.29, 1,345.13 and 620.41 is: 856.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.29 : 1,345.13 = 620.41 : x
  2. Step 2: Convert to fraction form
    974.29/1,345.13 = 620.41/x
  3. Step 3: Cross multiply
    974.29x = 1,345.13 × 620.41
  4. Step 4: Simplify right side
    974.29x = 834,532.10
  5. Step 5: Solve for x
    x = 834,532.10/974.29
  6. Step 6: Final answer
    x = 856.55

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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.