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Finding the Fourth Proportional to 751.59, 1,126.85 and 257.90

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Solution

The fourth proportional to 751.59, 1,126.85 and 257.90 is: 386.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.59 : 1,126.85 = 257.90 : x
  2. Step 2: Convert to fraction form
    751.59/1,126.85 = 257.90/x
  3. Step 3: Cross multiply
    751.59x = 1,126.85 × 257.90
  4. Step 4: Simplify right side
    751.59x = 290,607.69
  5. Step 5: Solve for x
    x = 290,607.69/751.59
  6. Step 6: Final answer
    x = 386.66

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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.