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Finding the Fourth Proportional to 40,703.31, 61,005.75 and 20,971.10

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Solution

The fourth proportional to 40,703.31, 61,005.75 and 20,971.10 is: 31,431.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,703.31 : 61,005.75 = 20,971.10 : x
  2. Step 2: Convert to fraction form
    40,703.31/61,005.75 = 20,971.10/x
  3. Step 3: Cross multiply
    40,703.31x = 61,005.75 × 20,971.10
  4. Step 4: Simplify right side
    40,703.31x = 1,279,357,683.83
  5. Step 5: Solve for x
    x = 1,279,357,683.83/40,703.31
  6. Step 6: Final answer
    x = 31,431.29

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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.