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Finding the Fourth Proportional to 605.12, 907.68 and 280.40

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Solution

The fourth proportional to 605.12, 907.68 and 280.40 is: 420.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.12 : 907.68 = 280.40 : x
  2. Step 2: Convert to fraction form
    605.12/907.68 = 280.40/x
  3. Step 3: Cross multiply
    605.12x = 907.68 × 280.40
  4. Step 4: Simplify right side
    605.12x = 254,513.47
  5. Step 5: Solve for x
    x = 254,513.47/605.12
  6. Step 6: Final answer
    x = 420.60

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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.