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Finding the Fourth Proportional to 1,137.87, 1,570.23 and 640.52

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Solution

The fourth proportional to 1,137.87, 1,570.23 and 640.52 is: 883.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.87 : 1,570.23 = 640.52 : x
  2. Step 2: Convert to fraction form
    1,137.87/1,570.23 = 640.52/x
  3. Step 3: Cross multiply
    1,137.87x = 1,570.23 × 640.52
  4. Step 4: Simplify right side
    1,137.87x = 1,005,755.87
  5. Step 5: Solve for x
    x = 1,005,755.87/1,137.87
  6. Step 6: Final answer
    x = 883.89

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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.