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Finding the Fourth Proportional to 856.08, 1,283.90 and 308.16

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Solution

The fourth proportional to 856.08, 1,283.90 and 308.16 is: 462.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.08 : 1,283.90 = 308.16 : x
  2. Step 2: Convert to fraction form
    856.08/1,283.90 = 308.16/x
  3. Step 3: Cross multiply
    856.08x = 1,283.90 × 308.16
  4. Step 4: Simplify right side
    856.08x = 395,645.08
  5. Step 5: Solve for x
    x = 395,645.08/856.08
  6. Step 6: Final answer
    x = 462.16

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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.