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Finding the Fourth Proportional to 478,039.36, 716,891.46 and 140,990.44

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Solution

The fourth proportional to 478,039.36, 716,891.46 and 140,990.44 is: 211,436.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,039.36 : 716,891.46 = 140,990.44 : x
  2. Step 2: Convert to fraction form
    478,039.36/716,891.46 = 140,990.44/x
  3. Step 3: Cross multiply
    478,039.36x = 716,891.46 × 140,990.44
  4. Step 4: Simplify right side
    478,039.36x = 101,074,842,377.64
  5. Step 5: Solve for x
    x = 101,074,842,377.64/478,039.36
  6. Step 6: Final answer
    x = 211,436.23

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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.