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Finding the Fourth Proportional to 631,146.40, 945,164.40 and 419,639.20

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Solution

The fourth proportional to 631,146.40, 945,164.40 and 419,639.20 is: 628,424.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,146.40 : 945,164.40 = 419,639.20 : x
  2. Step 2: Convert to fraction form
    631,146.40/945,164.40 = 419,639.20/x
  3. Step 3: Cross multiply
    631,146.40x = 945,164.40 × 419,639.20
  4. Step 4: Simplify right side
    631,146.40x = 396,628,032,684.48
  5. Step 5: Solve for x
    x = 396,628,032,684.48/631,146.40
  6. Step 6: Final answer
    x = 628,424.77

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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.