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Finding the Fourth Proportional to 62,640.98, 86,420.46 and 39,980.78

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Solution

The fourth proportional to 62,640.98, 86,420.46 and 39,980.78 is: 55,158.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,640.98 : 86,420.46 = 39,980.78 : x
  2. Step 2: Convert to fraction form
    62,640.98/86,420.46 = 39,980.78/x
  3. Step 3: Cross multiply
    62,640.98x = 86,420.46 × 39,980.78
  4. Step 4: Simplify right side
    62,640.98x = 3,455,157,398.76
  5. Step 5: Solve for x
    x = 3,455,157,398.76/62,640.98
  6. Step 6: Final answer
    x = 55,158.10

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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.