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Finding the Fourth Proportional to 620,471.40, 856,331.14 and 378,703.72

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Solution

The fourth proportional to 620,471.40, 856,331.14 and 378,703.72 is: 522,660.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,471.40 : 856,331.14 = 378,703.72 : x
  2. Step 2: Convert to fraction form
    620,471.40/856,331.14 = 378,703.72/x
  3. Step 3: Cross multiply
    620,471.40x = 856,331.14 × 378,703.72
  4. Step 4: Simplify right side
    620,471.40x = 324,295,788,269.84
  5. Step 5: Solve for x
    x = 324,295,788,269.84/620,471.40
  6. Step 6: Final answer
    x = 522,660.33

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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.