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Finding the Fourth Proportional to 697.71, 1,045.64 and 389.71

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Solution

The fourth proportional to 697.71, 1,045.64 and 389.71 is: 584.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.71 : 1,045.64 = 389.71 : x
  2. Step 2: Convert to fraction form
    697.71/1,045.64 = 389.71/x
  3. Step 3: Cross multiply
    697.71x = 1,045.64 × 389.71
  4. Step 4: Simplify right side
    697.71x = 407,496.36
  5. Step 5: Solve for x
    x = 407,496.36/697.71
  6. Step 6: Final answer
    x = 584.05

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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.