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Finding the Fourth Proportional to 935.14, 1,290.50 and 515.48

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Solution

The fourth proportional to 935.14, 1,290.50 and 515.48 is: 711.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.14 : 1,290.50 = 515.48 : x
  2. Step 2: Convert to fraction form
    935.14/1,290.50 = 515.48/x
  3. Step 3: Cross multiply
    935.14x = 1,290.50 × 515.48
  4. Step 4: Simplify right side
    935.14x = 665,224.36
  5. Step 5: Solve for x
    x = 665,224.36/935.14
  6. Step 6: Final answer
    x = 711.36

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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.