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Finding the Fourth Proportional to 85,321.80, 127,809.90 and 48,342.60

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Solution

The fourth proportional to 85,321.80, 127,809.90 and 48,342.60 is: 72,415.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,321.80 : 127,809.90 = 48,342.60 : x
  2. Step 2: Convert to fraction form
    85,321.80/127,809.90 = 48,342.60/x
  3. Step 3: Cross multiply
    85,321.80x = 127,809.90 × 48,342.60
  4. Step 4: Simplify right side
    85,321.80x = 6,178,662,871.74
  5. Step 5: Solve for x
    x = 6,178,662,871.74/85,321.80
  6. Step 6: Final answer
    x = 72,415.99

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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.