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Finding the Fourth Proportional to 1,053.15, 1,579.90 and 857.69

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Solution

The fourth proportional to 1,053.15, 1,579.90 and 857.69 is: 1,286.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.15 : 1,579.90 = 857.69 : x
  2. Step 2: Convert to fraction form
    1,053.15/1,579.90 = 857.69/x
  3. Step 3: Cross multiply
    1,053.15x = 1,579.90 × 857.69
  4. Step 4: Simplify right side
    1,053.15x = 1,355,064.43
  5. Step 5: Solve for x
    x = 1,355,064.43/1,053.15
  6. Step 6: Final answer
    x = 1,286.68

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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.