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Finding the Fourth Proportional to 131,987.81, 181,468.71 and 117,509.87

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Solution

The fourth proportional to 131,987.81, 181,468.71 and 117,509.87 is: 161,563.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,987.81 : 181,468.71 = 117,509.87 : x
  2. Step 2: Convert to fraction form
    131,987.81/181,468.71 = 117,509.87/x
  3. Step 3: Cross multiply
    131,987.81x = 181,468.71 × 117,509.87
  4. Step 4: Simplify right side
    131,987.81x = 21,324,364,974.84
  5. Step 5: Solve for x
    x = 21,324,364,974.84/131,987.81
  6. Step 6: Final answer
    x = 161,563.14

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.