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Finding the Fourth Proportional to 659.42, 989.70 and 274.94

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Solution

The fourth proportional to 659.42, 989.70 and 274.94 is: 412.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.42 : 989.70 = 274.94 : x
  2. Step 2: Convert to fraction form
    659.42/989.70 = 274.94/x
  3. Step 3: Cross multiply
    659.42x = 989.70 × 274.94
  4. Step 4: Simplify right side
    659.42x = 272,108.12
  5. Step 5: Solve for x
    x = 272,108.12/659.42
  6. Step 6: Final answer
    x = 412.65

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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.