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Finding the Fourth Proportional to 99,680.76, 149,407.99 and 87,649.63

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Solution

The fourth proportional to 99,680.76, 149,407.99 and 87,649.63 is: 131,374.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,680.76 : 149,407.99 = 87,649.63 : x
  2. Step 2: Convert to fraction form
    99,680.76/149,407.99 = 87,649.63/x
  3. Step 3: Cross multiply
    99,680.76x = 149,407.99 × 87,649.63
  4. Step 4: Simplify right side
    99,680.76x = 13,095,554,295.50
  5. Step 5: Solve for x
    x = 13,095,554,295.50/99,680.76
  6. Step 6: Final answer
    x = 131,374.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.