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Finding the Fourth Proportional to 940.21, 1,408.88 and 529.47

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Solution

The fourth proportional to 940.21, 1,408.88 and 529.47 is: 793.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.21 : 1,408.88 = 529.47 : x
  2. Step 2: Convert to fraction form
    940.21/1,408.88 = 529.47/x
  3. Step 3: Cross multiply
    940.21x = 1,408.88 × 529.47
  4. Step 4: Simplify right side
    940.21x = 745,961.02
  5. Step 5: Solve for x
    x = 745,961.02/940.21
  6. Step 6: Final answer
    x = 793.40

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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.