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Finding the Fourth Proportional to 615.95, 923.80 and 386.25

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Solution

The fourth proportional to 615.95, 923.80 and 386.25 is: 579.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.95 : 923.80 = 386.25 : x
  2. Step 2: Convert to fraction form
    615.95/923.80 = 386.25/x
  3. Step 3: Cross multiply
    615.95x = 923.80 × 386.25
  4. Step 4: Simplify right side
    615.95x = 356,817.75
  5. Step 5: Solve for x
    x = 356,817.75/615.95
  6. Step 6: Final answer
    x = 579.30

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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.