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Finding the Fourth Proportional to 243,428.78, 365,106.22 and 85,620.36

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Solution

The fourth proportional to 243,428.78, 365,106.22 and 85,620.36 is: 128,417.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,428.78 : 365,106.22 = 85,620.36 : x
  2. Step 2: Convert to fraction form
    243,428.78/365,106.22 = 85,620.36/x
  3. Step 3: Cross multiply
    243,428.78x = 365,106.22 × 85,620.36
  4. Step 4: Simplify right side
    243,428.78x = 31,260,525,994.64
  5. Step 5: Solve for x
    x = 31,260,525,994.64/243,428.78
  6. Step 6: Final answer
    x = 128,417.54

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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.