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Finding the Fourth Proportional to 777.39, 1,072.82 and 462.81

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Solution

The fourth proportional to 777.39, 1,072.82 and 462.81 is: 638.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.39 : 1,072.82 = 462.81 : x
  2. Step 2: Convert to fraction form
    777.39/1,072.82 = 462.81/x
  3. Step 3: Cross multiply
    777.39x = 1,072.82 × 462.81
  4. Step 4: Simplify right side
    777.39x = 496,511.82
  5. Step 5: Solve for x
    x = 496,511.82/777.39
  6. Step 6: Final answer
    x = 638.69

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1.5x scale

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.