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Finding the Fourth Proportional to 935.16, 1,290.67 and 713.69

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Solution

The fourth proportional to 935.16, 1,290.67 and 713.69 is: 985.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.16 : 1,290.67 = 713.69 : x
  2. Step 2: Convert to fraction form
    935.16/1,290.67 = 713.69/x
  3. Step 3: Cross multiply
    935.16x = 1,290.67 × 713.69
  4. Step 4: Simplify right side
    935.16x = 921,138.27
  5. Step 5: Solve for x
    x = 921,138.27/935.16
  6. Step 6: Final answer
    x = 985.01

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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.