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Finding the Fourth Proportional to 620,355.80, 930,643.05 and 221,228.30

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Solution

The fourth proportional to 620,355.80, 930,643.05 and 221,228.30 is: 331,881.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,355.80 : 930,643.05 = 221,228.30 : x
  2. Step 2: Convert to fraction form
    620,355.80/930,643.05 = 221,228.30/x
  3. Step 3: Cross multiply
    620,355.80x = 930,643.05 × 221,228.30
  4. Step 4: Simplify right side
    620,355.80x = 205,884,579,858.32
  5. Step 5: Solve for x
    x = 205,884,579,858.32/620,355.80
  6. Step 6: Final answer
    x = 331,881.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.