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Finding the Fourth Proportional to 620,256.88, 856,087.80 and 378,487.60

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Solution

The fourth proportional to 620,256.88, 856,087.80 and 378,487.60 is: 522,394.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,256.88 : 856,087.80 = 378,487.60 : x
  2. Step 2: Convert to fraction form
    620,256.88/856,087.80 = 378,487.60/x
  3. Step 3: Cross multiply
    620,256.88x = 856,087.80 × 378,487.60
  4. Step 4: Simplify right side
    620,256.88x = 324,018,616,811.28
  5. Step 5: Solve for x
    x = 324,018,616,811.28/620,256.88
  6. Step 6: Final answer
    x = 522,394.23

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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.