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Finding the Fourth Proportional to 855.59, 1,282.53 and 416.21

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Solution

The fourth proportional to 855.59, 1,282.53 and 416.21 is: 623.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.59 : 1,282.53 = 416.21 : x
  2. Step 2: Convert to fraction form
    855.59/1,282.53 = 416.21/x
  3. Step 3: Cross multiply
    855.59x = 1,282.53 × 416.21
  4. Step 4: Simplify right side
    855.59x = 533,801.81
  5. Step 5: Solve for x
    x = 533,801.81/855.59
  6. Step 6: Final answer
    x = 623.90

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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.