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Finding the Fourth Proportional to 62,643, 86,423.20 and 39,982.80

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Solution

The fourth proportional to 62,643, 86,423.20 and 39,982.80 is: 55,160.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,643 : 86,423.20 = 39,982.80 : x
  2. Step 2: Convert to fraction form
    62,643/86,423.20 = 39,982.80/x
  3. Step 3: Cross multiply
    62,643x = 86,423.20 × 39,982.80
  4. Step 4: Simplify right side
    62,643x = 3,455,441,520.96
  5. Step 5: Solve for x
    x = 3,455,441,520.96/62,643
  6. Step 6: Final answer
    x = 55,160.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.