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Finding the Fourth Proportional to 935.21, 1,290.63 and 515.62

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Solution

The fourth proportional to 935.21, 1,290.63 and 515.62 is: 711.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.21 : 1,290.63 = 515.62 : x
  2. Step 2: Convert to fraction form
    935.21/1,290.63 = 515.62/x
  3. Step 3: Cross multiply
    935.21x = 1,290.63 × 515.62
  4. Step 4: Simplify right side
    935.21x = 665,470.93
  5. Step 5: Solve for x
    x = 665,470.93/935.21
  6. Step 6: Final answer
    x = 711.57

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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.