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Finding the Fourth Proportional to 61,219.56, 91,820.70 and 19,661.16

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Solution

The fourth proportional to 61,219.56, 91,820.70 and 19,661.16 is: 29,488.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,219.56 : 91,820.70 = 19,661.16 : x
  2. Step 2: Convert to fraction form
    61,219.56/91,820.70 = 19,661.16/x
  3. Step 3: Cross multiply
    61,219.56x = 91,820.70 × 19,661.16
  4. Step 4: Simplify right side
    61,219.56x = 1,805,301,474.01
  5. Step 5: Solve for x
    x = 1,805,301,474.01/61,219.56
  6. Step 6: Final answer
    x = 29,488.97

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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.