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Finding the Fourth Proportional to 751.39, 1,126.79 and 312.35

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Solution

The fourth proportional to 751.39, 1,126.79 and 312.35 is: 468.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.39 : 1,126.79 = 312.35 : x
  2. Step 2: Convert to fraction form
    751.39/1,126.79 = 312.35/x
  3. Step 3: Cross multiply
    751.39x = 1,126.79 × 312.35
  4. Step 4: Simplify right side
    751.39x = 351,945.66
  5. Step 5: Solve for x
    x = 351,945.66/751.39
  6. Step 6: Final answer
    x = 468.39

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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.