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Finding the Fourth Proportional to 993.42, 1,370.43 and 713.70

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Solution

The fourth proportional to 993.42, 1,370.43 and 713.70 is: 984.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.42 : 1,370.43 = 713.70 : x
  2. Step 2: Convert to fraction form
    993.42/1,370.43 = 713.70/x
  3. Step 3: Cross multiply
    993.42x = 1,370.43 × 713.70
  4. Step 4: Simplify right side
    993.42x = 978,075.89
  5. Step 5: Solve for x
    x = 978,075.89/993.42
  6. Step 6: Final answer
    x = 984.55

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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.