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Finding the Fourth Proportional to 499.99, 689.94 and 278.95

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Solution

The fourth proportional to 499.99, 689.94 and 278.95 is: 384.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.99 : 689.94 = 278.95 : x
  2. Step 2: Convert to fraction form
    499.99/689.94 = 278.95/x
  3. Step 3: Cross multiply
    499.99x = 689.94 × 278.95
  4. Step 4: Simplify right side
    499.99x = 192,458.76
  5. Step 5: Solve for x
    x = 192,458.76/499.99
  6. Step 6: Final answer
    x = 384.93

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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.