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Finding the Fourth Proportional to 123,355.09, 170,231.43 and 72,368.71

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Solution

The fourth proportional to 123,355.09, 170,231.43 and 72,368.71 is: 99,869.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,355.09 : 170,231.43 = 72,368.71 : x
  2. Step 2: Convert to fraction form
    123,355.09/170,231.43 = 72,368.71/x
  3. Step 3: Cross multiply
    123,355.09x = 170,231.43 × 72,368.71
  4. Step 4: Simplify right side
    123,355.09x = 12,319,428,836.36
  5. Step 5: Solve for x
    x = 12,319,428,836.36/123,355.09
  6. Step 6: Final answer
    x = 99,869.64

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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.