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Finding the Fourth Proportional to 615.90, 922.89 and 399.09

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Solution

The fourth proportional to 615.90, 922.89 and 399.09 is: 598.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.90 : 922.89 = 399.09 : x
  2. Step 2: Convert to fraction form
    615.90/922.89 = 399.09/x
  3. Step 3: Cross multiply
    615.90x = 922.89 × 399.09
  4. Step 4: Simplify right side
    615.90x = 368,316.17
  5. Step 5: Solve for x
    x = 368,316.17/615.90
  6. Step 6: Final answer
    x = 598.01

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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.