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Finding the Fourth Proportional to 578.52, 867.62 and 285.72

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Solution

The fourth proportional to 578.52, 867.62 and 285.72 is: 428.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.52 : 867.62 = 285.72 : x
  2. Step 2: Convert to fraction form
    578.52/867.62 = 285.72/x
  3. Step 3: Cross multiply
    578.52x = 867.62 × 285.72
  4. Step 4: Simplify right side
    578.52x = 247,896.39
  5. Step 5: Solve for x
    x = 247,896.39/578.52
  6. Step 6: Final answer
    x = 428.50

Related Problems

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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.