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Finding the Fourth Proportional to 772.61, 1,066.37 and 641.39

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Solution

The fourth proportional to 772.61, 1,066.37 and 641.39 is: 885.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.61 : 1,066.37 = 641.39 : x
  2. Step 2: Convert to fraction form
    772.61/1,066.37 = 641.39/x
  3. Step 3: Cross multiply
    772.61x = 1,066.37 × 641.39
  4. Step 4: Simplify right side
    772.61x = 683,950.52
  5. Step 5: Solve for x
    x = 683,950.52/772.61
  6. Step 6: Final answer
    x = 885.25

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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.