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Finding the Fourth Proportional to 308,663.09, 425,971.56 and 172,688.90

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Solution

The fourth proportional to 308,663.09, 425,971.56 and 172,688.90 is: 238,319.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,663.09 : 425,971.56 = 172,688.90 : x
  2. Step 2: Convert to fraction form
    308,663.09/425,971.56 = 172,688.90/x
  3. Step 3: Cross multiply
    308,663.09x = 425,971.56 × 172,688.90
  4. Step 4: Simplify right side
    308,663.09x = 73,560,557,674.03
  5. Step 5: Solve for x
    x = 73,560,557,674.03/308,663.09
  6. Step 6: Final answer
    x = 238,319.90

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1.5x scale

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.