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Finding the Fourth Proportional to 539.90, 809.88 and 432.98

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Solution

The fourth proportional to 539.90, 809.88 and 432.98 is: 649.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.90 : 809.88 = 432.98 : x
  2. Step 2: Convert to fraction form
    539.90/809.88 = 432.98/x
  3. Step 3: Cross multiply
    539.90x = 809.88 × 432.98
  4. Step 4: Simplify right side
    539.90x = 350,661.84
  5. Step 5: Solve for x
    x = 350,661.84/539.90
  6. Step 6: Final answer
    x = 649.49

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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.