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Finding the Fourth Proportional to 425,091.60, 638,155.80 and 421,981.20

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Solution

The fourth proportional to 425,091.60, 638,155.80 and 421,981.20 is: 633,486.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,091.60 : 638,155.80 = 421,981.20 : x
  2. Step 2: Convert to fraction form
    425,091.60/638,155.80 = 421,981.20/x
  3. Step 3: Cross multiply
    425,091.60x = 638,155.80 × 421,981.20
  4. Step 4: Simplify right side
    425,091.60x = 269,289,750,270.96
  5. Step 5: Solve for x
    x = 269,289,750,270.96/425,091.60
  6. Step 6: Final answer
    x = 633,486.41

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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.