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Finding the Fourth Proportional to 578.40, 867.57 and 145.56

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Solution

The fourth proportional to 578.40, 867.57 and 145.56 is: 218.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.40 : 867.57 = 145.56 : x
  2. Step 2: Convert to fraction form
    578.40/867.57 = 145.56/x
  3. Step 3: Cross multiply
    578.40x = 867.57 × 145.56
  4. Step 4: Simplify right side
    578.40x = 126,283.49
  5. Step 5: Solve for x
    x = 126,283.49/578.40
  6. Step 6: Final answer
    x = 218.33

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.