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Finding the Fourth Proportional to 308,412.40, 425,589.42 and 172,457.56

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Solution

The fourth proportional to 308,412.40, 425,589.42 and 172,457.56 is: 237,980.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,412.40 : 425,589.42 = 172,457.56 : x
  2. Step 2: Convert to fraction form
    308,412.40/425,589.42 = 172,457.56/x
  3. Step 3: Cross multiply
    308,412.40x = 425,589.42 × 172,457.56
  4. Step 4: Simplify right side
    308,412.40x = 73,396,112,935.02
  5. Step 5: Solve for x
    x = 73,396,112,935.02/308,412.40
  6. Step 6: Final answer
    x = 237,980.42

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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.