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Finding the Fourth Proportional to 392,720.40, 589,080.60 and 339,267.60

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Solution

The fourth proportional to 392,720.40, 589,080.60 and 339,267.60 is: 508,901.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,720.40 : 589,080.60 = 339,267.60 : x
  2. Step 2: Convert to fraction form
    392,720.40/589,080.60 = 339,267.60/x
  3. Step 3: Cross multiply
    392,720.40x = 589,080.60 × 339,267.60
  4. Step 4: Simplify right side
    392,720.40x = 199,855,961,368.56
  5. Step 5: Solve for x
    x = 199,855,961,368.56/392,720.40
  6. Step 6: Final answer
    x = 508,901.40

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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.