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Finding the Fourth Proportional to 761.60, 1,135.48 and 742.64

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Solution

The fourth proportional to 761.60, 1,135.48 and 742.64 is: 1,107.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.60 : 1,135.48 = 742.64 : x
  2. Step 2: Convert to fraction form
    761.60/1,135.48 = 742.64/x
  3. Step 3: Cross multiply
    761.60x = 1,135.48 × 742.64
  4. Step 4: Simplify right side
    761.60x = 843,252.87
  5. Step 5: Solve for x
    x = 843,252.87/761.60
  6. Step 6: Final answer
    x = 1,107.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.