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Finding the Fourth Proportional to 1,086.45, 1,499.04 and 644.46

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Solution

The fourth proportional to 1,086.45, 1,499.04 and 644.46 is: 889.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.45 : 1,499.04 = 644.46 : x
  2. Step 2: Convert to fraction form
    1,086.45/1,499.04 = 644.46/x
  3. Step 3: Cross multiply
    1,086.45x = 1,499.04 × 644.46
  4. Step 4: Simplify right side
    1,086.45x = 966,071.32
  5. Step 5: Solve for x
    x = 966,071.32/1,086.45
  6. Step 6: Final answer
    x = 889.20

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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.