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Finding the Fourth Proportional to 899.76, 1,346.27 and 640.36

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Solution

The fourth proportional to 899.76, 1,346.27 and 640.36 is: 958.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.76 : 1,346.27 = 640.36 : x
  2. Step 2: Convert to fraction form
    899.76/1,346.27 = 640.36/x
  3. Step 3: Cross multiply
    899.76x = 1,346.27 × 640.36
  4. Step 4: Simplify right side
    899.76x = 862,091.97
  5. Step 5: Solve for x
    x = 862,091.97/899.76
  6. Step 6: Final answer
    x = 958.14

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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.