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Finding the Fourth Proportional to 772.70, 1,066.20 and 477.95

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Solution

The fourth proportional to 772.70, 1,066.20 and 477.95 is: 659.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.70 : 1,066.20 = 477.95 : x
  2. Step 2: Convert to fraction form
    772.70/1,066.20 = 477.95/x
  3. Step 3: Cross multiply
    772.70x = 1,066.20 × 477.95
  4. Step 4: Simplify right side
    772.70x = 509,590.29
  5. Step 5: Solve for x
    x = 509,590.29/772.70
  6. Step 6: Final answer
    x = 659.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.