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Finding the Fourth Proportional to 711.80, 981.36 and 515.36

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Solution

The fourth proportional to 711.80, 981.36 and 515.36 is: 710.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.80 : 981.36 = 515.36 : x
  2. Step 2: Convert to fraction form
    711.80/981.36 = 515.36/x
  3. Step 3: Cross multiply
    711.80x = 981.36 × 515.36
  4. Step 4: Simplify right side
    711.80x = 505,753.69
  5. Step 5: Solve for x
    x = 505,753.69/711.80
  6. Step 6: Final answer
    x = 710.53

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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.