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Finding the Fourth Proportional to 131,576, 181,579.20 and 71,960

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Solution

The fourth proportional to 131,576, 181,579.20 and 71,960 is: 99,307.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,576 : 181,579.20 = 71,960 : x
  2. Step 2: Convert to fraction form
    131,576/181,579.20 = 71,960/x
  3. Step 3: Cross multiply
    131,576x = 181,579.20 × 71,960
  4. Step 4: Simplify right side
    131,576x = 13,066,439,232
  5. Step 5: Solve for x
    x = 13,066,439,232/131,576
  6. Step 6: Final answer
    x = 99,307.16

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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.