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Finding the Fourth Proportional to 426,059,428.20, 639,089,142.30 and 426,059,428.20

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Solution

The fourth proportional to 426,059,428.20, 639,089,142.30 and 426,059,428.20 is: 639,089,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,059,428.20 : 639,089,142.30 = 426,059,428.20 : x
  2. Step 2: Convert to fraction form
    426,059,428.20/639,089,142.30 = 426,059,428.20/x
  3. Step 3: Cross multiply
    426,059,428.20x = 639,089,142.30 × 426,059,428.20
  4. Step 4: Simplify right side
    426,059,428.20x = 272,289,954,537,166,400
  5. Step 5: Solve for x
    x = 272,289,954,537,166,400/426,059,428.20
  6. Step 6: Final answer
    x = 639,089,142.30

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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.