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Finding the Fourth Proportional to 1,203.83, 1,812.12 and 859.55

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Solution

The fourth proportional to 1,203.83, 1,812.12 and 859.55 is: 1,293.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.83 : 1,812.12 = 859.55 : x
  2. Step 2: Convert to fraction form
    1,203.83/1,812.12 = 859.55/x
  3. Step 3: Cross multiply
    1,203.83x = 1,812.12 × 859.55
  4. Step 4: Simplify right side
    1,203.83x = 1,557,598.69
  5. Step 5: Solve for x
    x = 1,557,598.69/1,203.83
  6. Step 6: Final answer
    x = 1,293.87

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.