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Finding the Fourth Proportional to 1,455.13, 2,007.99 and 865.55

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Solution

The fourth proportional to 1,455.13, 2,007.99 and 865.55 is: 1,194.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.13 : 2,007.99 = 865.55 : x
  2. Step 2: Convert to fraction form
    1,455.13/2,007.99 = 865.55/x
  3. Step 3: Cross multiply
    1,455.13x = 2,007.99 × 865.55
  4. Step 4: Simplify right side
    1,455.13x = 1,738,020.76
  5. Step 5: Solve for x
    x = 1,738,020.76/1,455.13
  6. Step 6: Final answer
    x = 1,194.41

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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.