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Finding the Fourth Proportional to 935.69, 1,291.35 and 516.15

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Solution

The fourth proportional to 935.69, 1,291.35 and 516.15 is: 712.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.69 : 1,291.35 = 516.15 : x
  2. Step 2: Convert to fraction form
    935.69/1,291.35 = 516.15/x
  3. Step 3: Cross multiply
    935.69x = 1,291.35 × 516.15
  4. Step 4: Simplify right side
    935.69x = 666,530.30
  5. Step 5: Solve for x
    x = 666,530.30/935.69
  6. Step 6: Final answer
    x = 712.34

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Double scale
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1.5x scale

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.