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Finding the Fourth Proportional to 1,137.88, 1,570.16 and 640.54

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Solution

The fourth proportional to 1,137.88, 1,570.16 and 640.54 is: 883.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.88 : 1,570.16 = 640.54 : x
  2. Step 2: Convert to fraction form
    1,137.88/1,570.16 = 640.54/x
  3. Step 3: Cross multiply
    1,137.88x = 1,570.16 × 640.54
  4. Step 4: Simplify right side
    1,137.88x = 1,005,750.29
  5. Step 5: Solve for x
    x = 1,005,750.29/1,137.88
  6. Step 6: Final answer
    x = 883.88

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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.