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Finding the Fourth Proportional to 123,039.20, 169,817.64 and 72,063.20

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Solution

The fourth proportional to 123,039.20, 169,817.64 and 72,063.20 is: 99,461.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,039.20 : 169,817.64 = 72,063.20 : x
  2. Step 2: Convert to fraction form
    123,039.20/169,817.64 = 72,063.20/x
  3. Step 3: Cross multiply
    123,039.20x = 169,817.64 × 72,063.20
  4. Step 4: Simplify right side
    123,039.20x = 12,237,602,554.85
  5. Step 5: Solve for x
    x = 12,237,602,554.85/123,039.20
  6. Step 6: Final answer
    x = 99,461.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.