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Finding the Fourth Proportional to 1,257.90, 1,735.62 and 815.82

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Solution

The fourth proportional to 1,257.90, 1,735.62 and 815.82 is: 1,125.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.90 : 1,735.62 = 815.82 : x
  2. Step 2: Convert to fraction form
    1,257.90/1,735.62 = 815.82/x
  3. Step 3: Cross multiply
    1,257.90x = 1,735.62 × 815.82
  4. Step 4: Simplify right side
    1,257.90x = 1,415,953.51
  5. Step 5: Solve for x
    x = 1,415,953.51/1,257.90
  6. Step 6: Final answer
    x = 1,125.65

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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.