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Finding the Fourth Proportional to 726,343.40, 1,089,515.10 and 411,415.40

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Solution

The fourth proportional to 726,343.40, 1,089,515.10 and 411,415.40 is: 617,123.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    726,343.40 : 1,089,515.10 = 411,415.40 : x
  2. Step 2: Convert to fraction form
    726,343.40/1,089,515.10 = 411,415.40/x
  3. Step 3: Cross multiply
    726,343.40x = 1,089,515.10 × 411,415.40
  4. Step 4: Simplify right side
    726,343.40x = 448,243,290,672.54
  5. Step 5: Solve for x
    x = 448,243,290,672.54/726,343.40
  6. Step 6: Final answer
    x = 617,123.10

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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.