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Finding the Fourth Proportional to 259,459.68, 388,958.79 and 139,581

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Solution

The fourth proportional to 259,459.68, 388,958.79 and 139,581 is: 209,247.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,459.68 : 388,958.79 = 139,581 : x
  2. Step 2: Convert to fraction form
    259,459.68/388,958.79 = 139,581/x
  3. Step 3: Cross multiply
    259,459.68x = 388,958.79 × 139,581
  4. Step 4: Simplify right side
    259,459.68x = 54,291,256,866.99
  5. Step 5: Solve for x
    x = 54,291,256,866.99/259,459.68
  6. Step 6: Final answer
    x = 209,247.37

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1.5x scale

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.