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Finding the Fourth Proportional to 1,291.17, 1,944.30 and 928.47

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Solution

The fourth proportional to 1,291.17, 1,944.30 and 928.47 is: 1,398.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.17 : 1,944.30 = 928.47 : x
  2. Step 2: Convert to fraction form
    1,291.17/1,944.30 = 928.47/x
  3. Step 3: Cross multiply
    1,291.17x = 1,944.30 × 928.47
  4. Step 4: Simplify right side
    1,291.17x = 1,805,224.22
  5. Step 5: Solve for x
    x = 1,805,224.22/1,291.17
  6. Step 6: Final answer
    x = 1,398.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.