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Finding the Fourth Proportional to 767.79, 1,151.95 and 328.86

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Solution

The fourth proportional to 767.79, 1,151.95 and 328.86 is: 493.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.79 : 1,151.95 = 328.86 : x
  2. Step 2: Convert to fraction form
    767.79/1,151.95 = 328.86/x
  3. Step 3: Cross multiply
    767.79x = 1,151.95 × 328.86
  4. Step 4: Simplify right side
    767.79x = 378,830.28
  5. Step 5: Solve for x
    x = 378,830.28/767.79
  6. Step 6: Final answer
    x = 493.40

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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.