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Finding the Fourth Proportional to 620,297.60, 930,446.40 and 407,721.20

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Solution

The fourth proportional to 620,297.60, 930,446.40 and 407,721.20 is: 611,581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,297.60 : 930,446.40 = 407,721.20 : x
  2. Step 2: Convert to fraction form
    620,297.60/930,446.40 = 407,721.20/x
  3. Step 3: Cross multiply
    620,297.60x = 930,446.40 × 407,721.20
  4. Step 4: Simplify right side
    620,297.60x = 379,362,722,743.68
  5. Step 5: Solve for x
    x = 379,362,722,743.68/620,297.60
  6. Step 6: Final answer
    x = 611,581.80

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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.