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Finding the Fourth Proportional to 1,224.87, 1,835.86 and 785.55

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Solution

The fourth proportional to 1,224.87, 1,835.86 and 785.55 is: 1,177.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.87 : 1,835.86 = 785.55 : x
  2. Step 2: Convert to fraction form
    1,224.87/1,835.86 = 785.55/x
  3. Step 3: Cross multiply
    1,224.87x = 1,835.86 × 785.55
  4. Step 4: Simplify right side
    1,224.87x = 1,442,159.82
  5. Step 5: Solve for x
    x = 1,442,159.82/1,224.87
  6. Step 6: Final answer
    x = 1,177.40

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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.