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Finding the Fourth Proportional to 935.38, 1,291.14 and 640.12

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Solution

The fourth proportional to 935.38, 1,291.14 and 640.12 is: 883.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.38 : 1,291.14 = 640.12 : x
  2. Step 2: Convert to fraction form
    935.38/1,291.14 = 640.12/x
  3. Step 3: Cross multiply
    935.38x = 1,291.14 × 640.12
  4. Step 4: Simplify right side
    935.38x = 826,484.54
  5. Step 5: Solve for x
    x = 826,484.54/935.38
  6. Step 6: Final answer
    x = 883.58

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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.