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Finding the Fourth Proportional to 697.35, 978.45 and 697.35

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Solution

The fourth proportional to 697.35, 978.45 and 697.35 is: 978.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.35 : 978.45 = 697.35 : x
  2. Step 2: Convert to fraction form
    697.35/978.45 = 697.35/x
  3. Step 3: Cross multiply
    697.35x = 978.45 × 697.35
  4. Step 4: Simplify right side
    697.35x = 682,322.11
  5. Step 5: Solve for x
    x = 682,322.11/697.35
  6. Step 6: Final answer
    x = 978.45

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.