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Finding the Fourth Proportional to 840.97, 1,261.29 and 528.48

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Solution

The fourth proportional to 840.97, 1,261.29 and 528.48 is: 792.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.97 : 1,261.29 = 528.48 : x
  2. Step 2: Convert to fraction form
    840.97/1,261.29 = 528.48/x
  3. Step 3: Cross multiply
    840.97x = 1,261.29 × 528.48
  4. Step 4: Simplify right side
    840.97x = 666,565.55
  5. Step 5: Solve for x
    x = 666,565.55/840.97
  6. Step 6: Final answer
    x = 792.61

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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.