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Finding the Fourth Proportional to 85,638.47, 128,604.71 and 52,552.80

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Solution

The fourth proportional to 85,638.47, 128,604.71 and 52,552.80 is: 78,919.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,638.47 : 128,604.71 = 52,552.80 : x
  2. Step 2: Convert to fraction form
    85,638.47/128,604.71 = 52,552.80/x
  3. Step 3: Cross multiply
    85,638.47x = 128,604.71 × 52,552.80
  4. Step 4: Simplify right side
    85,638.47x = 6,758,537,735.07
  5. Step 5: Solve for x
    x = 6,758,537,735.07/85,638.47
  6. Step 6: Final answer
    x = 78,919.42

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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.