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Finding the Fourth Proportional to 935.78, 1,291.45 and 516.17

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Solution

The fourth proportional to 935.78, 1,291.45 and 516.17 is: 712.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.78 : 1,291.45 = 516.17 : x
  2. Step 2: Convert to fraction form
    935.78/1,291.45 = 516.17/x
  3. Step 3: Cross multiply
    935.78x = 1,291.45 × 516.17
  4. Step 4: Simplify right side
    935.78x = 666,600.00
  5. Step 5: Solve for x
    x = 666,600.00/935.78
  6. Step 6: Final answer
    x = 712.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.