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Finding the Fourth Proportional to 131,356, 181,271.28 and 71,740

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Solution

The fourth proportional to 131,356, 181,271.28 and 71,740 is: 99,001.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,356 : 181,271.28 = 71,740 : x
  2. Step 2: Convert to fraction form
    131,356/181,271.28 = 71,740/x
  3. Step 3: Cross multiply
    131,356x = 181,271.28 × 71,740
  4. Step 4: Simplify right side
    131,356x = 13,004,401,627.20
  5. Step 5: Solve for x
    x = 13,004,401,627.20/131,356
  6. Step 6: Final answer
    x = 99,001.20

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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.