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Finding the Fourth Proportional to 499.97, 690 and 278.93

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Solution

The fourth proportional to 499.97, 690 and 278.93 is: 384.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.97 : 690 = 278.93 : x
  2. Step 2: Convert to fraction form
    499.97/690 = 278.93/x
  3. Step 3: Cross multiply
    499.97x = 690 × 278.93
  4. Step 4: Simplify right side
    499.97x = 192,458.25
  5. Step 5: Solve for x
    x = 192,458.25/499.97
  6. Step 6: Final answer
    x = 384.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.