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Finding the Fourth Proportional to 855.76, 1,282.52 and 421.60

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Solution

The fourth proportional to 855.76, 1,282.52 and 421.60 is: 631.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.76 : 1,282.52 = 421.60 : x
  2. Step 2: Convert to fraction form
    855.76/1,282.52 = 421.60/x
  3. Step 3: Cross multiply
    855.76x = 1,282.52 × 421.60
  4. Step 4: Simplify right side
    855.76x = 540,710.43
  5. Step 5: Solve for x
    x = 540,710.43/855.76
  6. Step 6: Final answer
    x = 631.85

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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.