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Finding the Fourth Proportional to 620,128.40, 855,870.80 and 378,551.60

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Solution

The fourth proportional to 620,128.40, 855,870.80 and 378,551.60 is: 522,458.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,128.40 : 855,870.80 = 378,551.60 : x
  2. Step 2: Convert to fraction form
    620,128.40/855,870.80 = 378,551.60/x
  3. Step 3: Cross multiply
    620,128.40x = 855,870.80 × 378,551.60
  4. Step 4: Simplify right side
    620,128.40x = 323,991,260,733.28
  5. Step 5: Solve for x
    x = 323,991,260,733.28/620,128.40
  6. Step 6: Final answer
    x = 522,458.35

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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.