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Finding the Fourth Proportional to 751.16, 1,126.84 and 257.66

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Solution

The fourth proportional to 751.16, 1,126.84 and 257.66 is: 386.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.16 : 1,126.84 = 257.66 : x
  2. Step 2: Convert to fraction form
    751.16/1,126.84 = 257.66/x
  3. Step 3: Cross multiply
    751.16x = 1,126.84 × 257.66
  4. Step 4: Simplify right side
    751.16x = 290,341.59
  5. Step 5: Solve for x
    x = 290,341.59/751.16
  6. Step 6: Final answer
    x = 386.52

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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.