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Finding the Fourth Proportional to 103,111.99, 142,101.91 and 80,415.11

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Solution

The fourth proportional to 103,111.99, 142,101.91 and 80,415.11 is: 110,822.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,111.99 : 142,101.91 = 80,415.11 : x
  2. Step 2: Convert to fraction form
    103,111.99/142,101.91 = 80,415.11/x
  3. Step 3: Cross multiply
    103,111.99x = 142,101.91 × 80,415.11
  4. Step 4: Simplify right side
    103,111.99x = 11,427,141,179.63
  5. Step 5: Solve for x
    x = 11,427,141,179.63/103,111.99
  6. Step 6: Final answer
    x = 110,822.63

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1.5x scale

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.