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Finding the Fourth Proportional to 85,521.36, 128,212.88 and 35,638.96

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Solution

The fourth proportional to 85,521.36, 128,212.88 and 35,638.96 is: 53,429.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,521.36 : 128,212.88 = 35,638.96 : x
  2. Step 2: Convert to fraction form
    85,521.36/128,212.88 = 35,638.96/x
  3. Step 3: Cross multiply
    85,521.36x = 128,212.88 × 35,638.96
  4. Step 4: Simplify right side
    85,521.36x = 4,569,373,701.80
  5. Step 5: Solve for x
    x = 4,569,373,701.80/85,521.36
  6. Step 6: Final answer
    x = 53,429.62

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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.