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Finding the Fourth Proportional to 974.79, 1,345.82 and 620.91

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Solution

The fourth proportional to 974.79, 1,345.82 and 620.91 is: 857.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.79 : 1,345.82 = 620.91 : x
  2. Step 2: Convert to fraction form
    974.79/1,345.82 = 620.91/x
  3. Step 3: Cross multiply
    974.79x = 1,345.82 × 620.91
  4. Step 4: Simplify right side
    974.79x = 835,629.99
  5. Step 5: Solve for x
    x = 835,629.99/974.79
  6. Step 6: Final answer
    x = 857.24

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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.