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Finding the Fourth Proportional to 72,949.78, 100,670.70 and 39,415.78

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Solution

The fourth proportional to 72,949.78, 100,670.70 and 39,415.78 is: 54,393.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,949.78 : 100,670.70 = 39,415.78 : x
  2. Step 2: Convert to fraction form
    72,949.78/100,670.70 = 39,415.78/x
  3. Step 3: Cross multiply
    72,949.78x = 100,670.70 × 39,415.78
  4. Step 4: Simplify right side
    72,949.78x = 3,968,014,215.58
  5. Step 5: Solve for x
    x = 3,968,014,215.58/72,949.78
  6. Step 6: Final answer
    x = 54,393.78

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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.