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Finding the Fourth Proportional to 605.44, 907.92 and 390.40

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Solution

The fourth proportional to 605.44, 907.92 and 390.40 is: 585.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.44 : 907.92 = 390.40 : x
  2. Step 2: Convert to fraction form
    605.44/907.92 = 390.40/x
  3. Step 3: Cross multiply
    605.44x = 907.92 × 390.40
  4. Step 4: Simplify right side
    605.44x = 354,451.97
  5. Step 5: Solve for x
    x = 354,451.97/605.44
  6. Step 6: Final answer
    x = 585.45

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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.