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Finding the Fourth Proportional to 713.47, 984.55 and 398.67

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Solution

The fourth proportional to 713.47, 984.55 and 398.67 is: 550.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.47 : 984.55 = 398.67 : x
  2. Step 2: Convert to fraction form
    713.47/984.55 = 398.67/x
  3. Step 3: Cross multiply
    713.47x = 984.55 × 398.67
  4. Step 4: Simplify right side
    713.47x = 392,510.55
  5. Step 5: Solve for x
    x = 392,510.55/713.47
  6. Step 6: Final answer
    x = 550.14

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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.