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Finding the Fourth Proportional to 131,616, 181,630.80 and 72,000

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Solution

The fourth proportional to 131,616, 181,630.80 and 72,000 is: 99,360.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,616 : 181,630.80 = 72,000 : x
  2. Step 2: Convert to fraction form
    131,616/181,630.80 = 72,000/x
  3. Step 3: Cross multiply
    131,616x = 181,630.80 × 72,000
  4. Step 4: Simplify right side
    131,616x = 13,077,417,600
  5. Step 5: Solve for x
    x = 13,077,417,600/131,616
  6. Step 6: Final answer
    x = 99,360.39

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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.