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Finding the Fourth Proportional to 393,647.40, 590,471.10 and 144,426.60

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Solution

The fourth proportional to 393,647.40, 590,471.10 and 144,426.60 is: 216,639.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,647.40 : 590,471.10 = 144,426.60 : x
  2. Step 2: Convert to fraction form
    393,647.40/590,471.10 = 144,426.60/x
  3. Step 3: Cross multiply
    393,647.40x = 590,471.10 × 144,426.60
  4. Step 4: Simplify right side
    393,647.40x = 85,279,733,371.26
  5. Step 5: Solve for x
    x = 85,279,733,371.26/393,647.40
  6. Step 6: Final answer
    x = 216,639.90

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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.