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Finding the Fourth Proportional to 1,059.87, 1,462.29 and 640.35

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Solution

The fourth proportional to 1,059.87, 1,462.29 and 640.35 is: 883.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,059.87 : 1,462.29 = 640.35 : x
  2. Step 2: Convert to fraction form
    1,059.87/1,462.29 = 640.35/x
  3. Step 3: Cross multiply
    1,059.87x = 1,462.29 × 640.35
  4. Step 4: Simplify right side
    1,059.87x = 936,375.00
  5. Step 5: Solve for x
    x = 936,375.00/1,059.87
  6. Step 6: Final answer
    x = 883.48

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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.