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Finding the Fourth Proportional to 697.80, 939.15 and 697.80

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Solution

The fourth proportional to 697.80, 939.15 and 697.80 is: 939.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.80 : 939.15 = 697.80 : x
  2. Step 2: Convert to fraction form
    697.80/939.15 = 697.80/x
  3. Step 3: Cross multiply
    697.80x = 939.15 × 697.80
  4. Step 4: Simplify right side
    697.80x = 655,338.87
  5. Step 5: Solve for x
    x = 655,338.87/697.80
  6. Step 6: Final answer
    x = 939.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.