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Finding the Fourth Proportional to 425,628,938.20, 638,443,407.30 and 425,628,938.20

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Solution

The fourth proportional to 425,628,938.20, 638,443,407.30 and 425,628,938.20 is: 638,443,407.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,628,938.20 : 638,443,407.30 = 425,628,938.20 : x
  2. Step 2: Convert to fraction form
    425,628,938.20/638,443,407.30 = 425,628,938.20/x
  3. Step 3: Cross multiply
    425,628,938.20x = 638,443,407.30 × 425,628,938.20
  4. Step 4: Simplify right side
    425,628,938.20x = 271,739,989,549,889,088
  5. Step 5: Solve for x
    x = 271,739,989,549,889,088/425,628,938.20
  6. Step 6: Final answer
    x = 638,443,407.30

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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.