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Finding the Fourth Proportional to 856.44, 1,284.64 and 661.72

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Solution

The fourth proportional to 856.44, 1,284.64 and 661.72 is: 992.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.44 : 1,284.64 = 661.72 : x
  2. Step 2: Convert to fraction form
    856.44/1,284.64 = 661.72/x
  3. Step 3: Cross multiply
    856.44x = 1,284.64 × 661.72
  4. Step 4: Simplify right side
    856.44x = 850,071.98
  5. Step 5: Solve for x
    x = 850,071.98/856.44
  6. Step 6: Final answer
    x = 992.56

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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.