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Finding the Fourth Proportional to 642,739.20, 965,145.60 and 485,145.60

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Solution

The fourth proportional to 642,739.20, 965,145.60 and 485,145.60 is: 728,500.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,739.20 : 965,145.60 = 485,145.60 : x
  2. Step 2: Convert to fraction form
    642,739.20/965,145.60 = 485,145.60/x
  3. Step 3: Cross multiply
    642,739.20x = 965,145.60 × 485,145.60
  4. Step 4: Simplify right side
    642,739.20x = 468,236,141,199.36
  5. Step 5: Solve for x
    x = 468,236,141,199.36/642,739.20
  6. Step 6: Final answer
    x = 728,500.99

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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.