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Finding the Fourth Proportional to 138,603.05, 191,272.29 and 74,940.80

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Solution

The fourth proportional to 138,603.05, 191,272.29 and 74,940.80 is: 103,418.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,603.05 : 191,272.29 = 74,940.80 : x
  2. Step 2: Convert to fraction form
    138,603.05/191,272.29 = 74,940.80/x
  3. Step 3: Cross multiply
    138,603.05x = 191,272.29 × 74,940.80
  4. Step 4: Simplify right side
    138,603.05x = 14,334,097,193.04
  5. Step 5: Solve for x
    x = 14,334,097,193.04/138,603.05
  6. Step 6: Final answer
    x = 103,418.34

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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.