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Finding the Fourth Proportional to 72,949.68, 100,670.40 and 39,415.68

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Solution

The fourth proportional to 72,949.68, 100,670.40 and 39,415.68 is: 54,393.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,949.68 : 100,670.40 = 39,415.68 : x
  2. Step 2: Convert to fraction form
    72,949.68/100,670.40 = 39,415.68/x
  3. Step 3: Cross multiply
    72,949.68x = 100,670.40 × 39,415.68
  4. Step 4: Simplify right side
    72,949.68x = 3,967,992,271.87
  5. Step 5: Solve for x
    x = 3,967,992,271.87/72,949.68
  6. Step 6: Final answer
    x = 54,393.55

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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.