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Finding the Fourth Proportional to 539.88, 810 and 485.52

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Solution

The fourth proportional to 539.88, 810 and 485.52 is: 728.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.88 : 810 = 485.52 : x
  2. Step 2: Convert to fraction form
    539.88/810 = 485.52/x
  3. Step 3: Cross multiply
    539.88x = 810 × 485.52
  4. Step 4: Simplify right side
    539.88x = 393,271.20
  5. Step 5: Solve for x
    x = 393,271.20/539.88
  6. Step 6: Final answer
    x = 728.44

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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.