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Finding the Fourth Proportional to 680,615.88, 939,233.94 and 378,803.40

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Solution

The fourth proportional to 680,615.88, 939,233.94 and 378,803.40 is: 522,739.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,615.88 : 939,233.94 = 378,803.40 : x
  2. Step 2: Convert to fraction form
    680,615.88/939,233.94 = 378,803.40/x
  3. Step 3: Cross multiply
    680,615.88x = 939,233.94 × 378,803.40
  4. Step 4: Simplify right side
    680,615.88x = 355,785,009,867.40
  5. Step 5: Solve for x
    x = 355,785,009,867.40/680,615.88
  6. Step 6: Final answer
    x = 522,739.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.