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Finding the Fourth Proportional to 72,039.80, 108,123.70 and 42,420.60

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Solution

The fourth proportional to 72,039.80, 108,123.70 and 42,420.60 is: 63,668.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,039.80 : 108,123.70 = 42,420.60 : x
  2. Step 2: Convert to fraction form
    72,039.80/108,123.70 = 42,420.60/x
  3. Step 3: Cross multiply
    72,039.80x = 108,123.70 × 42,420.60
  4. Step 4: Simplify right side
    72,039.80x = 4,586,672,228.22
  5. Step 5: Solve for x
    x = 4,586,672,228.22/72,039.80
  6. Step 6: Final answer
    x = 63,668.59

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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.