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Finding the Fourth Proportional to 934.49, 1,403.55 and 761.28

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Solution

The fourth proportional to 934.49, 1,403.55 and 761.28 is: 1,143.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.49 : 1,403.55 = 761.28 : x
  2. Step 2: Convert to fraction form
    934.49/1,403.55 = 761.28/x
  3. Step 3: Cross multiply
    934.49x = 1,403.55 × 761.28
  4. Step 4: Simplify right side
    934.49x = 1,068,494.54
  5. Step 5: Solve for x
    x = 1,068,494.54/934.49
  6. Step 6: Final answer
    x = 1,143.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.