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Finding the Fourth Proportional to 848.80, 1,272.16 and 839.68

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Solution

The fourth proportional to 848.80, 1,272.16 and 839.68 is: 1,258.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.80 : 1,272.16 = 839.68 : x
  2. Step 2: Convert to fraction form
    848.80/1,272.16 = 839.68/x
  3. Step 3: Cross multiply
    848.80x = 1,272.16 × 839.68
  4. Step 4: Simplify right side
    848.80x = 1,068,207.31
  5. Step 5: Solve for x
    x = 1,068,207.31/848.80
  6. Step 6: Final answer
    x = 1,258.49

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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.