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Finding the Fourth Proportional to 858.02, 1,286.68 and 419.46

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Solution

The fourth proportional to 858.02, 1,286.68 and 419.46 is: 629.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.02 : 1,286.68 = 419.46 : x
  2. Step 2: Convert to fraction form
    858.02/1,286.68 = 419.46/x
  3. Step 3: Cross multiply
    858.02x = 1,286.68 × 419.46
  4. Step 4: Simplify right side
    858.02x = 539,710.79
  5. Step 5: Solve for x
    x = 539,710.79/858.02
  6. Step 6: Final answer
    x = 629.02

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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.