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Finding the Fourth Proportional to 405,983.20, 608,974.80 and 398,984.80

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Solution

The fourth proportional to 405,983.20, 608,974.80 and 398,984.80 is: 598,477.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,983.20 : 608,974.80 = 398,984.80 : x
  2. Step 2: Convert to fraction form
    405,983.20/608,974.80 = 398,984.80/x
  3. Step 3: Cross multiply
    405,983.20x = 608,974.80 × 398,984.80
  4. Step 4: Simplify right side
    405,983.20x = 242,971,688,783.04
  5. Step 5: Solve for x
    x = 242,971,688,783.04/405,983.20
  6. Step 6: Final answer
    x = 598,477.20

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Double scale
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Similar ratio
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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.