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Finding the Fourth Proportional to 131,390, 181,318.44 and 71,774

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Solution

The fourth proportional to 131,390, 181,318.44 and 71,774 is: 99,048.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,390 : 181,318.44 = 71,774 : x
  2. Step 2: Convert to fraction form
    131,390/181,318.44 = 71,774/x
  3. Step 3: Cross multiply
    131,390x = 181,318.44 × 71,774
  4. Step 4: Simplify right side
    131,390x = 13,013,949,712.56
  5. Step 5: Solve for x
    x = 13,013,949,712.56/131,390
  6. Step 6: Final answer
    x = 99,048.25

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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.