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Finding the Fourth Proportional to 1,455.12, 2,007.38 and 865.32

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Solution

The fourth proportional to 1,455.12, 2,007.38 and 865.32 is: 1,193.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.12 : 2,007.38 = 865.32 : x
  2. Step 2: Convert to fraction form
    1,455.12/2,007.38 = 865.32/x
  3. Step 3: Cross multiply
    1,455.12x = 2,007.38 × 865.32
  4. Step 4: Simplify right side
    1,455.12x = 1,737,026.06
  5. Step 5: Solve for x
    x = 1,737,026.06/1,455.12
  6. Step 6: Final answer
    x = 1,193.73

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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.