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Finding the Fourth Proportional to 680,409.72, 938,971.44 and 378,603.72

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Solution

The fourth proportional to 680,409.72, 938,971.44 and 378,603.72 is: 522,476.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,409.72 : 938,971.44 = 378,603.72 : x
  2. Step 2: Convert to fraction form
    680,409.72/938,971.44 = 378,603.72/x
  3. Step 3: Cross multiply
    680,409.72x = 938,971.44 × 378,603.72
  4. Step 4: Simplify right side
    680,409.72x = 355,498,080,157.76
  5. Step 5: Solve for x
    x = 355,498,080,157.76/680,409.72
  6. Step 6: Final answer
    x = 522,476.49

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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.