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Finding the Fourth Proportional to 777.76, 1,072.90 and 482.51

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Solution

The fourth proportional to 777.76, 1,072.90 and 482.51 is: 665.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.76 : 1,072.90 = 482.51 : x
  2. Step 2: Convert to fraction form
    777.76/1,072.90 = 482.51/x
  3. Step 3: Cross multiply
    777.76x = 1,072.90 × 482.51
  4. Step 4: Simplify right side
    777.76x = 517,684.98
  5. Step 5: Solve for x
    x = 517,684.98/777.76
  6. Step 6: Final answer
    x = 665.61

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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.