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Finding the Fourth Proportional to 858.75, 1,287.86 and 273.72

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Solution

The fourth proportional to 858.75, 1,287.86 and 273.72 is: 410.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.75 : 1,287.86 = 273.72 : x
  2. Step 2: Convert to fraction form
    858.75/1,287.86 = 273.72/x
  3. Step 3: Cross multiply
    858.75x = 1,287.86 × 273.72
  4. Step 4: Simplify right side
    858.75x = 352,513.04
  5. Step 5: Solve for x
    x = 352,513.04/858.75
  6. Step 6: Final answer
    x = 410.50

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1.5x scale

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.