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Finding the Fourth Proportional to 751.34, 1,126.86 and 257.76

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Solution

The fourth proportional to 751.34, 1,126.86 and 257.76 is: 386.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.34 : 1,126.86 = 257.76 : x
  2. Step 2: Convert to fraction form
    751.34/1,126.86 = 257.76/x
  3. Step 3: Cross multiply
    751.34x = 1,126.86 × 257.76
  4. Step 4: Simplify right side
    751.34x = 290,459.43
  5. Step 5: Solve for x
    x = 290,459.43/751.34
  6. Step 6: Final answer
    x = 386.59

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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.