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Finding the Fourth Proportional to 100,111.81, 150,009.64 and 81,300.31

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Solution

The fourth proportional to 100,111.81, 150,009.64 and 81,300.31 is: 121,822.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,111.81 : 150,009.64 = 81,300.31 : x
  2. Step 2: Convert to fraction form
    100,111.81/150,009.64 = 81,300.31/x
  3. Step 3: Cross multiply
    100,111.81x = 150,009.64 × 81,300.31
  4. Step 4: Simplify right side
    100,111.81x = 12,195,830,234.99
  5. Step 5: Solve for x
    x = 12,195,830,234.99/100,111.81
  6. Step 6: Final answer
    x = 121,822.09

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1.5x scale

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.