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Finding the Fourth Proportional to 500.05, 690.06 and 278.99

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Solution

The fourth proportional to 500.05, 690.06 and 278.99 is: 385.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.05 : 690.06 = 278.99 : x
  2. Step 2: Convert to fraction form
    500.05/690.06 = 278.99/x
  3. Step 3: Cross multiply
    500.05x = 690.06 × 278.99
  4. Step 4: Simplify right side
    500.05x = 192,518.44
  5. Step 5: Solve for x
    x = 192,518.44/500.05
  6. Step 6: Final answer
    x = 385.00

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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.