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Finding the Fourth Proportional to 961.44, 1,327.20 and 651.36

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Solution

The fourth proportional to 961.44, 1,327.20 and 651.36 is: 899.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.44 : 1,327.20 = 651.36 : x
  2. Step 2: Convert to fraction form
    961.44/1,327.20 = 651.36/x
  3. Step 3: Cross multiply
    961.44x = 1,327.20 × 651.36
  4. Step 4: Simplify right side
    961.44x = 864,484.99
  5. Step 5: Solve for x
    x = 864,484.99/961.44
  6. Step 6: Final answer
    x = 899.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.