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Finding the Fourth Proportional to 749.21, 1,122.29 and 378.78

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Solution

The fourth proportional to 749.21, 1,122.29 and 378.78 is: 567.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.21 : 1,122.29 = 378.78 : x
  2. Step 2: Convert to fraction form
    749.21/1,122.29 = 378.78/x
  3. Step 3: Cross multiply
    749.21x = 1,122.29 × 378.78
  4. Step 4: Simplify right side
    749.21x = 425,099.11
  5. Step 5: Solve for x
    x = 425,099.11/749.21
  6. Step 6: Final answer
    x = 567.40

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Half scale
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Double scale
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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.