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Finding the Fourth Proportional to 72,145.45, 99,588.51 and 64,578.43

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Solution

The fourth proportional to 72,145.45, 99,588.51 and 64,578.43 is: 89,143.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,145.45 : 99,588.51 = 64,578.43 : x
  2. Step 2: Convert to fraction form
    72,145.45/99,588.51 = 64,578.43/x
  3. Step 3: Cross multiply
    72,145.45x = 99,588.51 × 64,578.43
  4. Step 4: Simplify right side
    72,145.45x = 6,431,269,621.84
  5. Step 5: Solve for x
    x = 6,431,269,621.84/72,145.45
  6. Step 6: Final answer
    x = 89,143.11

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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.