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Finding the Fourth Proportional to 848.97, 1,272.38 and 642.89

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Solution

The fourth proportional to 848.97, 1,272.38 and 642.89 is: 963.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.97 : 1,272.38 = 642.89 : x
  2. Step 2: Convert to fraction form
    848.97/1,272.38 = 642.89/x
  3. Step 3: Cross multiply
    848.97x = 1,272.38 × 642.89
  4. Step 4: Simplify right side
    848.97x = 818,000.34
  5. Step 5: Solve for x
    x = 818,000.34/848.97
  6. Step 6: Final answer
    x = 963.52

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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.