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Finding the Fourth Proportional to 578.58, 867.90 and 289.92

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Solution

The fourth proportional to 578.58, 867.90 and 289.92 is: 434.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.58 : 867.90 = 289.92 : x
  2. Step 2: Convert to fraction form
    578.58/867.90 = 289.92/x
  3. Step 3: Cross multiply
    578.58x = 867.90 × 289.92
  4. Step 4: Simplify right side
    578.58x = 251,621.57
  5. Step 5: Solve for x
    x = 251,621.57/578.58
  6. Step 6: Final answer
    x = 434.90

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.