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Finding the Fourth Proportional to 1,257, 1,884.42 and 640.32

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Solution

The fourth proportional to 1,257, 1,884.42 and 640.32 is: 959.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257 : 1,884.42 = 640.32 : x
  2. Step 2: Convert to fraction form
    1,257/1,884.42 = 640.32/x
  3. Step 3: Cross multiply
    1,257x = 1,884.42 × 640.32
  4. Step 4: Simplify right side
    1,257x = 1,206,631.81
  5. Step 5: Solve for x
    x = 1,206,631.81/1,257
  6. Step 6: Final answer
    x = 959.93

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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.