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Finding the Fourth Proportional to 772.62, 1,158.64 and 479.69

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Solution

The fourth proportional to 772.62, 1,158.64 and 479.69 is: 719.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.62 : 1,158.64 = 479.69 : x
  2. Step 2: Convert to fraction form
    772.62/1,158.64 = 479.69/x
  3. Step 3: Cross multiply
    772.62x = 1,158.64 × 479.69
  4. Step 4: Simplify right side
    772.62x = 555,785.37
  5. Step 5: Solve for x
    x = 555,785.37/772.62
  6. Step 6: Final answer
    x = 719.36

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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.