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Finding the Fourth Proportional to 620,133.68, 855,878.10 and 378,556.86

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Solution

The fourth proportional to 620,133.68, 855,878.10 and 378,556.86 is: 522,465.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,133.68 : 855,878.10 = 378,556.86 : x
  2. Step 2: Convert to fraction form
    620,133.68/855,878.10 = 378,556.86/x
  3. Step 3: Cross multiply
    620,133.68x = 855,878.10 × 378,556.86
  4. Step 4: Simplify right side
    620,133.68x = 323,998,526,078.77
  5. Step 5: Solve for x
    x = 323,998,526,078.77/620,133.68
  6. Step 6: Final answer
    x = 522,465.62

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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.