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Finding the Fourth Proportional to 1,051.82, 1,577.76 and 640.63

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Solution

The fourth proportional to 1,051.82, 1,577.76 and 640.63 is: 960.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.82 : 1,577.76 = 640.63 : x
  2. Step 2: Convert to fraction form
    1,051.82/1,577.76 = 640.63/x
  3. Step 3: Cross multiply
    1,051.82x = 1,577.76 × 640.63
  4. Step 4: Simplify right side
    1,051.82x = 1,010,760.39
  5. Step 5: Solve for x
    x = 1,010,760.39/1,051.82
  6. Step 6: Final answer
    x = 960.96

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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.