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Finding the Fourth Proportional to 946.44, 1,305.63 and 666.72

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Solution

The fourth proportional to 946.44, 1,305.63 and 666.72 is: 919.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.44 : 1,305.63 = 666.72 : x
  2. Step 2: Convert to fraction form
    946.44/1,305.63 = 666.72/x
  3. Step 3: Cross multiply
    946.44x = 1,305.63 × 666.72
  4. Step 4: Simplify right side
    946.44x = 870,489.63
  5. Step 5: Solve for x
    x = 870,489.63/946.44
  6. Step 6: Final answer
    x = 919.75

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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.