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Finding the Fourth Proportional to 1,455.17, 2,007.99 and 857.52

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Solution

The fourth proportional to 1,455.17, 2,007.99 and 857.52 is: 1,183.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.17 : 2,007.99 = 857.52 : x
  2. Step 2: Convert to fraction form
    1,455.17/2,007.99 = 857.52/x
  3. Step 3: Cross multiply
    1,455.17x = 2,007.99 × 857.52
  4. Step 4: Simplify right side
    1,455.17x = 1,721,891.58
  5. Step 5: Solve for x
    x = 1,721,891.58/1,455.17
  6. Step 6: Final answer
    x = 1,183.30

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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.