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Finding the Fourth Proportional to 69,438.72, 104,160 and 43,219.20

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Solution

The fourth proportional to 69,438.72, 104,160 and 43,219.20 is: 64,830.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,438.72 : 104,160 = 43,219.20 : x
  2. Step 2: Convert to fraction form
    69,438.72/104,160 = 43,219.20/x
  3. Step 3: Cross multiply
    69,438.72x = 104,160 × 43,219.20
  4. Step 4: Simplify right side
    69,438.72x = 4,501,711,872
  5. Step 5: Solve for x
    x = 4,501,711,872/69,438.72
  6. Step 6: Final answer
    x = 64,830.00

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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.