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Finding the Fourth Proportional to 528.12, 792.19 and 285.12

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Solution

The fourth proportional to 528.12, 792.19 and 285.12 is: 427.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.12 : 792.19 = 285.12 : x
  2. Step 2: Convert to fraction form
    528.12/792.19 = 285.12/x
  3. Step 3: Cross multiply
    528.12x = 792.19 × 285.12
  4. Step 4: Simplify right side
    528.12x = 225,868.50
  5. Step 5: Solve for x
    x = 225,868.50/528.12
  6. Step 6: Final answer
    x = 427.68

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Half scale
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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.