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Finding the Fourth Proportional to 935.78, 1,291.38 and 521.78

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Solution

The fourth proportional to 935.78, 1,291.38 and 521.78 is: 720.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.78 : 1,291.38 = 521.78 : x
  2. Step 2: Convert to fraction form
    935.78/1,291.38 = 521.78/x
  3. Step 3: Cross multiply
    935.78x = 1,291.38 × 521.78
  4. Step 4: Simplify right side
    935.78x = 673,816.26
  5. Step 5: Solve for x
    x = 673,816.26/935.78
  6. Step 6: Final answer
    x = 720.06

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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.