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Finding the Fourth Proportional to 768.92, 1,151.60 and 479.74

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Solution

The fourth proportional to 768.92, 1,151.60 and 479.74 is: 718.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.92 : 1,151.60 = 479.74 : x
  2. Step 2: Convert to fraction form
    768.92/1,151.60 = 479.74/x
  3. Step 3: Cross multiply
    768.92x = 1,151.60 × 479.74
  4. Step 4: Simplify right side
    768.92x = 552,468.58
  5. Step 5: Solve for x
    x = 552,468.58/768.92
  6. Step 6: Final answer
    x = 718.50

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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.