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Finding the Fourth Proportional to 61,612.56, 91,973.16 and 54,139.20

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Solution

The fourth proportional to 61,612.56, 91,973.16 and 54,139.20 is: 80,817.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,612.56 : 91,973.16 = 54,139.20 : x
  2. Step 2: Convert to fraction form
    61,612.56/91,973.16 = 54,139.20/x
  3. Step 3: Cross multiply
    61,612.56x = 91,973.16 × 54,139.20
  4. Step 4: Simplify right side
    61,612.56x = 4,979,353,303.87
  5. Step 5: Solve for x
    x = 4,979,353,303.87/61,612.56
  6. Step 6: Final answer
    x = 80,817.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.