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Finding the Fourth Proportional to 848.43, 1,272.65 and 643.37

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Solution

The fourth proportional to 848.43, 1,272.65 and 643.37 is: 965.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.43 : 1,272.65 = 643.37 : x
  2. Step 2: Convert to fraction form
    848.43/1,272.65 = 643.37/x
  3. Step 3: Cross multiply
    848.43x = 1,272.65 × 643.37
  4. Step 4: Simplify right side
    848.43x = 818,775.25
  5. Step 5: Solve for x
    x = 818,775.25/848.43
  6. Step 6: Final answer
    x = 965.05

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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.