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Finding the Fourth Proportional to 840.60, 1,261.86 and 749.88

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Solution

The fourth proportional to 840.60, 1,261.86 and 749.88 is: 1,125.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.60 : 1,261.86 = 749.88 : x
  2. Step 2: Convert to fraction form
    840.60/1,261.86 = 749.88/x
  3. Step 3: Cross multiply
    840.60x = 1,261.86 × 749.88
  4. Step 4: Simplify right side
    840.60x = 946,243.58
  5. Step 5: Solve for x
    x = 946,243.58/840.60
  6. Step 6: Final answer
    x = 1,125.68

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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.