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Finding the Fourth Proportional to 777.17, 1,072.87 and 541.91

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Solution

The fourth proportional to 777.17, 1,072.87 and 541.91 is: 748.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.17 : 1,072.87 = 541.91 : x
  2. Step 2: Convert to fraction form
    777.17/1,072.87 = 541.91/x
  3. Step 3: Cross multiply
    777.17x = 1,072.87 × 541.91
  4. Step 4: Simplify right side
    777.17x = 581,400.31
  5. Step 5: Solve for x
    x = 581,400.31/777.17
  6. Step 6: Final answer
    x = 748.10

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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.