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Finding the Fourth Proportional to 848.72, 1,272.76 and 386.38

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Solution

The fourth proportional to 848.72, 1,272.76 and 386.38 is: 579.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.72 : 1,272.76 = 386.38 : x
  2. Step 2: Convert to fraction form
    848.72/1,272.76 = 386.38/x
  3. Step 3: Cross multiply
    848.72x = 1,272.76 × 386.38
  4. Step 4: Simplify right side
    848.72x = 491,769.01
  5. Step 5: Solve for x
    x = 491,769.01/848.72
  6. Step 6: Final answer
    x = 579.42

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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.