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Finding the Fourth Proportional to 642.25, 962.70 and 459.10

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Solution

The fourth proportional to 642.25, 962.70 and 459.10 is: 688.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.25 : 962.70 = 459.10 : x
  2. Step 2: Convert to fraction form
    642.25/962.70 = 459.10/x
  3. Step 3: Cross multiply
    642.25x = 962.70 × 459.10
  4. Step 4: Simplify right side
    642.25x = 441,975.57
  5. Step 5: Solve for x
    x = 441,975.57/642.25
  6. Step 6: Final answer
    x = 688.17

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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.