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Finding the Fourth Proportional to 848.24, 1,272.81 and 385.99

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Solution

The fourth proportional to 848.24, 1,272.81 and 385.99 is: 579.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.24 : 1,272.81 = 385.99 : x
  2. Step 2: Convert to fraction form
    848.24/1,272.81 = 385.99/x
  3. Step 3: Cross multiply
    848.24x = 1,272.81 × 385.99
  4. Step 4: Simplify right side
    848.24x = 491,291.93
  5. Step 5: Solve for x
    x = 491,291.93/848.24
  6. Step 6: Final answer
    x = 579.19

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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.