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Finding the Fourth Proportional to 697.75, 1,045.53 and 389.68

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Solution

The fourth proportional to 697.75, 1,045.53 and 389.68 is: 583.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.75 : 1,045.53 = 389.68 : x
  2. Step 2: Convert to fraction form
    697.75/1,045.53 = 389.68/x
  3. Step 3: Cross multiply
    697.75x = 1,045.53 × 389.68
  4. Step 4: Simplify right side
    697.75x = 407,419.52
  5. Step 5: Solve for x
    x = 407,419.52/697.75
  6. Step 6: Final answer
    x = 583.91

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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.