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Finding the Fourth Proportional to 642.79, 962.43 and 539.79

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Solution

The fourth proportional to 642.79, 962.43 and 539.79 is: 808.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.79 : 962.43 = 539.79 : x
  2. Step 2: Convert to fraction form
    642.79/962.43 = 539.79/x
  3. Step 3: Cross multiply
    642.79x = 962.43 × 539.79
  4. Step 4: Simplify right side
    642.79x = 519,510.09
  5. Step 5: Solve for x
    x = 519,510.09/642.79
  6. Step 6: Final answer
    x = 808.21

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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.