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Finding the Fourth Proportional to 761.33, 1,142.43 and 322.55

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Solution

The fourth proportional to 761.33, 1,142.43 and 322.55 is: 484.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.33 : 1,142.43 = 322.55 : x
  2. Step 2: Convert to fraction form
    761.33/1,142.43 = 322.55/x
  3. Step 3: Cross multiply
    761.33x = 1,142.43 × 322.55
  4. Step 4: Simplify right side
    761.33x = 368,490.80
  5. Step 5: Solve for x
    x = 368,490.80/761.33
  6. Step 6: Final answer
    x = 484.01

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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.