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Finding the Fourth Proportional to 761.70, 1,142.55 and 328.75

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Solution

The fourth proportional to 761.70, 1,142.55 and 328.75 is: 493.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.70 : 1,142.55 = 328.75 : x
  2. Step 2: Convert to fraction form
    761.70/1,142.55 = 328.75/x
  3. Step 3: Cross multiply
    761.70x = 1,142.55 × 328.75
  4. Step 4: Simplify right side
    761.70x = 375,613.31
  5. Step 5: Solve for x
    x = 375,613.31/761.70
  6. Step 6: Final answer
    x = 493.13

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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.