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Finding the Fourth Proportional to 72,175.76, 99,606.00 and 39,909.81

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Solution

The fourth proportional to 72,175.76, 99,606.00 and 39,909.81 is: 55,077.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,175.76 : 99,606.00 = 39,909.81 : x
  2. Step 2: Convert to fraction form
    72,175.76/99,606.00 = 39,909.81/x
  3. Step 3: Cross multiply
    72,175.76x = 99,606.00 × 39,909.81
  4. Step 4: Simplify right side
    72,175.76x = 3,975,257,058.04
  5. Step 5: Solve for x
    x = 3,975,257,058.04/72,175.76
  6. Step 6: Final answer
    x = 55,077.45

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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.