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Finding the Fourth Proportional to 42,908.94, 64,406.47 and 39,981.09

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Solution

The fourth proportional to 42,908.94, 64,406.47 and 39,981.09 is: 60,011.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,908.94 : 64,406.47 = 39,981.09 : x
  2. Step 2: Convert to fraction form
    42,908.94/64,406.47 = 39,981.09/x
  3. Step 3: Cross multiply
    42,908.94x = 64,406.47 × 39,981.09
  4. Step 4: Simplify right side
    42,908.94x = 2,575,040,977.74
  5. Step 5: Solve for x
    x = 2,575,040,977.74/42,908.94
  6. Step 6: Final answer
    x = 60,011.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.