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Finding the Fourth Proportional to 131,388, 181,315.68 and 71,772

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Solution

The fourth proportional to 131,388, 181,315.68 and 71,772 is: 99,045.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,388 : 181,315.68 = 71,772 : x
  2. Step 2: Convert to fraction form
    131,388/181,315.68 = 71,772/x
  3. Step 3: Cross multiply
    131,388x = 181,315.68 × 71,772
  4. Step 4: Simplify right side
    131,388x = 13,013,388,984.96
  5. Step 5: Solve for x
    x = 13,013,388,984.96/131,388
  6. Step 6: Final answer
    x = 99,045.49

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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.