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Finding the Fourth Proportional to 858.18, 1,287.40 and 371.23

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Solution

The fourth proportional to 858.18, 1,287.40 and 371.23 is: 556.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.18 : 1,287.40 = 371.23 : x
  2. Step 2: Convert to fraction form
    858.18/1,287.40 = 371.23/x
  3. Step 3: Cross multiply
    858.18x = 1,287.40 × 371.23
  4. Step 4: Simplify right side
    858.18x = 477,921.50
  5. Step 5: Solve for x
    x = 477,921.50/858.18
  6. Step 6: Final answer
    x = 556.90

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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.