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Finding the Fourth Proportional to 940.62, 1,408.74 and 528.90

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Solution

The fourth proportional to 940.62, 1,408.74 and 528.90 is: 792.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.62 : 1,408.74 = 528.90 : x
  2. Step 2: Convert to fraction form
    940.62/1,408.74 = 528.90/x
  3. Step 3: Cross multiply
    940.62x = 1,408.74 × 528.90
  4. Step 4: Simplify right side
    940.62x = 745,082.59
  5. Step 5: Solve for x
    x = 745,082.59/940.62
  6. Step 6: Final answer
    x = 792.12

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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.