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Finding the Fourth Proportional to 848.20, 1,272.26 and 643.14

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Solution

The fourth proportional to 848.20, 1,272.26 and 643.14 is: 964.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.20 : 1,272.26 = 643.14 : x
  2. Step 2: Convert to fraction form
    848.20/1,272.26 = 643.14/x
  3. Step 3: Cross multiply
    848.20x = 1,272.26 × 643.14
  4. Step 4: Simplify right side
    848.20x = 818,241.30
  5. Step 5: Solve for x
    x = 818,241.30/848.20
  6. Step 6: Final answer
    x = 964.68

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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.