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Finding the Fourth Proportional to 112,291.31, 154,962.11 and 61,990.31

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Solution

The fourth proportional to 112,291.31, 154,962.11 and 61,990.31 is: 85,546.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,291.31 : 154,962.11 = 61,990.31 : x
  2. Step 2: Convert to fraction form
    112,291.31/154,962.11 = 61,990.31/x
  3. Step 3: Cross multiply
    112,291.31x = 154,962.11 × 61,990.31
  4. Step 4: Simplify right side
    112,291.31x = 9,606,149,779.54
  5. Step 5: Solve for x
    x = 9,606,149,779.54/112,291.31
  6. Step 6: Final answer
    x = 85,546.69

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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.