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Finding the Fourth Proportional to 85,190.74, 127,690.53 and 28,978.36

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Solution

The fourth proportional to 85,190.74, 127,690.53 and 28,978.36 is: 43,435.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,190.74 : 127,690.53 = 28,978.36 : x
  2. Step 2: Convert to fraction form
    85,190.74/127,690.53 = 28,978.36/x
  3. Step 3: Cross multiply
    85,190.74x = 127,690.53 × 28,978.36
  4. Step 4: Simplify right side
    85,190.74x = 3,700,262,146.93
  5. Step 5: Solve for x
    x = 3,700,262,146.93/85,190.74
  6. Step 6: Final answer
    x = 43,435.03

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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.