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Finding the Fourth Proportional to 862.08, 1,293.12 and 285

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Solution

The fourth proportional to 862.08, 1,293.12 and 285 is: 427.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.08 : 1,293.12 = 285 : x
  2. Step 2: Convert to fraction form
    862.08/1,293.12 = 285/x
  3. Step 3: Cross multiply
    862.08x = 1,293.12 × 285
  4. Step 4: Simplify right side
    862.08x = 368,539.20
  5. Step 5: Solve for x
    x = 368,539.20/862.08
  6. Step 6: Final answer
    x = 427.50

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Double scale
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Similar ratio
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1.5x scale

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.