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Finding the Fourth Proportional to 935.60, 1,291.13 and 515.96

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Solution

The fourth proportional to 935.60, 1,291.13 and 515.96 is: 712.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.60 : 1,291.13 = 515.96 : x
  2. Step 2: Convert to fraction form
    935.60/1,291.13 = 515.96/x
  3. Step 3: Cross multiply
    935.60x = 1,291.13 × 515.96
  4. Step 4: Simplify right side
    935.60x = 666,174.66
  5. Step 5: Solve for x
    x = 666,174.66/935.60
  6. Step 6: Final answer
    x = 712.03

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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.