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Finding the Fourth Proportional to 697.87, 1,045.80 and 385.58

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Solution

The fourth proportional to 697.87, 1,045.80 and 385.58 is: 577.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.87 : 1,045.80 = 385.58 : x
  2. Step 2: Convert to fraction form
    697.87/1,045.80 = 385.58/x
  3. Step 3: Cross multiply
    697.87x = 1,045.80 × 385.58
  4. Step 4: Simplify right side
    697.87x = 403,239.56
  5. Step 5: Solve for x
    x = 403,239.56/697.87
  6. Step 6: Final answer
    x = 577.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.