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Finding the Fourth Proportional to 137,445.54, 205,651.73 and 81,312.14

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Solution

The fourth proportional to 137,445.54, 205,651.73 and 81,312.14 is: 121,662.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,445.54 : 205,651.73 = 81,312.14 : x
  2. Step 2: Convert to fraction form
    137,445.54/205,651.73 = 81,312.14/x
  3. Step 3: Cross multiply
    137,445.54x = 205,651.73 × 81,312.14
  4. Step 4: Simplify right side
    137,445.54x = 16,721,980,826.18
  5. Step 5: Solve for x
    x = 16,721,980,826.18/137,445.54
  6. Step 6: Final answer
    x = 121,662.59

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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.