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Finding the Fourth Proportional to 858.87, 1,287.23 and 371.39

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Solution

The fourth proportional to 858.87, 1,287.23 and 371.39 is: 556.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.87 : 1,287.23 = 371.39 : x
  2. Step 2: Convert to fraction form
    858.87/1,287.23 = 371.39/x
  3. Step 3: Cross multiply
    858.87x = 1,287.23 × 371.39
  4. Step 4: Simplify right side
    858.87x = 478,056.06
  5. Step 5: Solve for x
    x = 478,056.06/858.87
  6. Step 6: Final answer
    x = 556.61

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.