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Finding the Fourth Proportional to 338,571.49, 507,709.58 and 128,061.81

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Solution

The fourth proportional to 338,571.49, 507,709.58 and 128,061.81 is: 192,036.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,571.49 : 507,709.58 = 128,061.81 : x
  2. Step 2: Convert to fraction form
    338,571.49/507,709.58 = 128,061.81/x
  3. Step 3: Cross multiply
    338,571.49x = 507,709.58 × 128,061.81
  4. Step 4: Simplify right side
    338,571.49x = 65,018,207,769.14
  5. Step 5: Solve for x
    x = 65,018,207,769.14/338,571.49
  6. Step 6: Final answer
    x = 192,036.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.