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Finding the Fourth Proportional to 85,840.40, 128,760.60 and 54,347.60

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Solution

The fourth proportional to 85,840.40, 128,760.60 and 54,347.60 is: 81,521.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,840.40 : 128,760.60 = 54,347.60 : x
  2. Step 2: Convert to fraction form
    85,840.40/128,760.60 = 54,347.60/x
  3. Step 3: Cross multiply
    85,840.40x = 128,760.60 × 54,347.60
  4. Step 4: Simplify right side
    85,840.40x = 6,997,829,584.56
  5. Step 5: Solve for x
    x = 6,997,829,584.56/85,840.40
  6. Step 6: Final answer
    x = 81,521.40

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1.5x scale

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.