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Finding the Fourth Proportional to 862.45, 1,293.75 and 314.51

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Solution

The fourth proportional to 862.45, 1,293.75 and 314.51 is: 471.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.45 : 1,293.75 = 314.51 : x
  2. Step 2: Convert to fraction form
    862.45/1,293.75 = 314.51/x
  3. Step 3: Cross multiply
    862.45x = 1,293.75 × 314.51
  4. Step 4: Simplify right side
    862.45x = 406,890.84
  5. Step 5: Solve for x
    x = 406,890.84/862.45
  6. Step 6: Final answer
    x = 471.79

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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.