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Finding the Fourth Proportional to 751.68, 1,127.55 and 203.91

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Solution

The fourth proportional to 751.68, 1,127.55 and 203.91 is: 305.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.68 : 1,127.55 = 203.91 : x
  2. Step 2: Convert to fraction form
    751.68/1,127.55 = 203.91/x
  3. Step 3: Cross multiply
    751.68x = 1,127.55 × 203.91
  4. Step 4: Simplify right side
    751.68x = 229,918.72
  5. Step 5: Solve for x
    x = 229,918.72/751.68
  6. Step 6: Final answer
    x = 305.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.