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Finding the Fourth Proportional to 1,857.16, 2,785.94 and 687.47

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Solution

The fourth proportional to 1,857.16, 2,785.94 and 687.47 is: 1,031.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.16 : 2,785.94 = 687.47 : x
  2. Step 2: Convert to fraction form
    1,857.16/2,785.94 = 687.47/x
  3. Step 3: Cross multiply
    1,857.16x = 2,785.94 × 687.47
  4. Step 4: Simplify right side
    1,857.16x = 1,915,250.17
  5. Step 5: Solve for x
    x = 1,915,250.17/1,857.16
  6. Step 6: Final answer
    x = 1,031.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.