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Finding the Fourth Proportional to 425,851.40, 638,777.10 and 405,115.40

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Solution

The fourth proportional to 425,851.40, 638,777.10 and 405,115.40 is: 607,673.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,851.40 : 638,777.10 = 405,115.40 : x
  2. Step 2: Convert to fraction form
    425,851.40/638,777.10 = 405,115.40/x
  3. Step 3: Cross multiply
    425,851.40x = 638,777.10 × 405,115.40
  4. Step 4: Simplify right side
    425,851.40x = 258,778,440,377.34
  5. Step 5: Solve for x
    x = 258,778,440,377.34/425,851.40
  6. Step 6: Final answer
    x = 607,673.10

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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.