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Finding the Fourth Proportional to 858.48, 1,287.12 and 273.29

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Solution

The fourth proportional to 858.48, 1,287.12 and 273.29 is: 409.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.48 : 1,287.12 = 273.29 : x
  2. Step 2: Convert to fraction form
    858.48/1,287.12 = 273.29/x
  3. Step 3: Cross multiply
    858.48x = 1,287.12 × 273.29
  4. Step 4: Simplify right side
    858.48x = 351,750.59
  5. Step 5: Solve for x
    x = 351,750.59/858.48
  6. Step 6: Final answer
    x = 409.74

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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.