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Finding the Fourth Proportional to 1,027.05, 1,415.19 and 915.33

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Solution

The fourth proportional to 1,027.05, 1,415.19 and 915.33 is: 1,261.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,027.05 : 1,415.19 = 915.33 : x
  2. Step 2: Convert to fraction form
    1,027.05/1,415.19 = 915.33/x
  3. Step 3: Cross multiply
    1,027.05x = 1,415.19 × 915.33
  4. Step 4: Simplify right side
    1,027.05x = 1,295,365.86
  5. Step 5: Solve for x
    x = 1,295,365.86/1,027.05
  6. Step 6: Final answer
    x = 1,261.25

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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.