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Finding the Fourth Proportional to 85,638.72, 128,291.84 and 63,108.50

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Solution

The fourth proportional to 85,638.72, 128,291.84 and 63,108.50 is: 94,540.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,638.72 : 128,291.84 = 63,108.50 : x
  2. Step 2: Convert to fraction form
    85,638.72/128,291.84 = 63,108.50/x
  3. Step 3: Cross multiply
    85,638.72x = 128,291.84 × 63,108.50
  4. Step 4: Simplify right side
    85,638.72x = 8,096,305,584.64
  5. Step 5: Solve for x
    x = 8,096,305,584.64/85,638.72
  6. Step 6: Final answer
    x = 94,540.25

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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.