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Finding the Fourth Proportional to 974.81, 1,345.28 and 555.20

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Solution

The fourth proportional to 974.81, 1,345.28 and 555.20 is: 766.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.81 : 1,345.28 = 555.20 : x
  2. Step 2: Convert to fraction form
    974.81/1,345.28 = 555.20/x
  3. Step 3: Cross multiply
    974.81x = 1,345.28 × 555.20
  4. Step 4: Simplify right side
    974.81x = 746,896.68
  5. Step 5: Solve for x
    x = 746,896.68/974.81
  6. Step 6: Final answer
    x = 766.20

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Double scale
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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.