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Finding the Fourth Proportional to 312,578.28, 431,359.70 and 169,338.69

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Solution

The fourth proportional to 312,578.28, 431,359.70 and 169,338.69 is: 233,688.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,578.28 : 431,359.70 = 169,338.69 : x
  2. Step 2: Convert to fraction form
    312,578.28/431,359.70 = 169,338.69/x
  3. Step 3: Cross multiply
    312,578.28x = 431,359.70 × 169,338.69
  4. Step 4: Simplify right side
    312,578.28x = 73,045,885,670.10
  5. Step 5: Solve for x
    x = 73,045,885,670.10/312,578.28
  6. Step 6: Final answer
    x = 233,688.30

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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.