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Finding the Fourth Proportional to 751.88, 1,127.89 and 289.78

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Solution

The fourth proportional to 751.88, 1,127.89 and 289.78 is: 434.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.88 : 1,127.89 = 289.78 : x
  2. Step 2: Convert to fraction form
    751.88/1,127.89 = 289.78/x
  3. Step 3: Cross multiply
    751.88x = 1,127.89 × 289.78
  4. Step 4: Simplify right side
    751.88x = 326,837.51
  5. Step 5: Solve for x
    x = 326,837.51/751.88
  6. Step 6: Final answer
    x = 434.69

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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.