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Finding the Fourth Proportional to 855.96, 1,282.38 and 612.01

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Solution

The fourth proportional to 855.96, 1,282.38 and 612.01 is: 916.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.96 : 1,282.38 = 612.01 : x
  2. Step 2: Convert to fraction form
    855.96/1,282.38 = 612.01/x
  3. Step 3: Cross multiply
    855.96x = 1,282.38 × 612.01
  4. Step 4: Simplify right side
    855.96x = 784,829.38
  5. Step 5: Solve for x
    x = 784,829.38/855.96
  6. Step 6: Final answer
    x = 916.90

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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.