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Finding the Fourth Proportional to 935.32, 1,290.75 and 515.65

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Solution

The fourth proportional to 935.32, 1,290.75 and 515.65 is: 711.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.32 : 1,290.75 = 515.65 : x
  2. Step 2: Convert to fraction form
    935.32/1,290.75 = 515.65/x
  3. Step 3: Cross multiply
    935.32x = 1,290.75 × 515.65
  4. Step 4: Simplify right side
    935.32x = 665,572.66
  5. Step 5: Solve for x
    x = 665,572.66/935.32
  6. Step 6: Final answer
    x = 711.60

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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.