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Finding the Fourth Proportional to 974.28, 1,345.08 and 643.26

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Solution

The fourth proportional to 974.28, 1,345.08 and 643.26 is: 888.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.28 : 1,345.08 = 643.26 : x
  2. Step 2: Convert to fraction form
    974.28/1,345.08 = 643.26/x
  3. Step 3: Cross multiply
    974.28x = 1,345.08 × 643.26
  4. Step 4: Simplify right side
    974.28x = 865,236.16
  5. Step 5: Solve for x
    x = 865,236.16/974.28
  6. Step 6: Final answer
    x = 888.08

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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.