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Finding the Fourth Proportional to 750.75, 1,125.35 and 312.25

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Solution

The fourth proportional to 750.75, 1,125.35 and 312.25 is: 468.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.75 : 1,125.35 = 312.25 : x
  2. Step 2: Convert to fraction form
    750.75/1,125.35 = 312.25/x
  3. Step 3: Cross multiply
    750.75x = 1,125.35 × 312.25
  4. Step 4: Simplify right side
    750.75x = 351,393.35
  5. Step 5: Solve for x
    x = 351,393.35/750.75
  6. Step 6: Final answer
    x = 468.06

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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.