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Finding the Fourth Proportional to 1,137.68, 1,570.16 and 640.37

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Solution

The fourth proportional to 1,137.68, 1,570.16 and 640.37 is: 883.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.68 : 1,570.16 = 640.37 : x
  2. Step 2: Convert to fraction form
    1,137.68/1,570.16 = 640.37/x
  3. Step 3: Cross multiply
    1,137.68x = 1,570.16 × 640.37
  4. Step 4: Simplify right side
    1,137.68x = 1,005,472.31
  5. Step 5: Solve for x
    x = 1,005,472.31/1,137.68
  6. Step 6: Final answer
    x = 883.80

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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.