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Finding the Fourth Proportional to 620,223.87, 855,988.32 and 378,455.28

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Solution

The fourth proportional to 620,223.87, 855,988.32 and 378,455.28 is: 522,316.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,223.87 : 855,988.32 = 378,455.28 : x
  2. Step 2: Convert to fraction form
    620,223.87/855,988.32 = 378,455.28/x
  3. Step 3: Cross multiply
    620,223.87x = 855,988.32 × 378,455.28
  4. Step 4: Simplify right side
    620,223.87x = 323,953,299,322.33
  5. Step 5: Solve for x
    x = 323,953,299,322.33/620,223.87
  6. Step 6: Final answer
    x = 522,316.72

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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.