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Finding the Fourth Proportional to 974.54, 1,345.74 and 906.50

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Solution

The fourth proportional to 974.54, 1,345.74 and 906.50 is: 1,251.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.54 : 1,345.74 = 906.50 : x
  2. Step 2: Convert to fraction form
    974.54/1,345.74 = 906.50/x
  3. Step 3: Cross multiply
    974.54x = 1,345.74 × 906.50
  4. Step 4: Simplify right side
    974.54x = 1,219,913.31
  5. Step 5: Solve for x
    x = 1,219,913.31/974.54
  6. Step 6: Final answer
    x = 1,251.78

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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.