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Finding the Fourth Proportional to 108,020.40, 162,030.60 and 81,776.40

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Solution

The fourth proportional to 108,020.40, 162,030.60 and 81,776.40 is: 122,664.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,020.40 : 162,030.60 = 81,776.40 : x
  2. Step 2: Convert to fraction form
    108,020.40/162,030.60 = 81,776.40/x
  3. Step 3: Cross multiply
    108,020.40x = 162,030.60 × 81,776.40
  4. Step 4: Simplify right side
    108,020.40x = 13,250,279,157.84
  5. Step 5: Solve for x
    x = 13,250,279,157.84/108,020.40
  6. Step 6: Final answer
    x = 122,664.60

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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.