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Finding the Fourth Proportional to 426.66, 639.98 and 399.93

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Solution

The fourth proportional to 426.66, 639.98 and 399.93 is: 599.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.66 : 639.98 = 399.93 : x
  2. Step 2: Convert to fraction form
    426.66/639.98 = 399.93/x
  3. Step 3: Cross multiply
    426.66x = 639.98 × 399.93
  4. Step 4: Simplify right side
    426.66x = 255,947.20
  5. Step 5: Solve for x
    x = 255,947.20/426.66
  6. Step 6: Final answer
    x = 599.89

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.