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Finding the Fourth Proportional to 1,178,994.55, 1,768,865.48 and 420,819.21

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Solution

The fourth proportional to 1,178,994.55, 1,768,865.48 and 420,819.21 is: 631,362.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178,994.55 : 1,768,865.48 = 420,819.21 : x
  2. Step 2: Convert to fraction form
    1,178,994.55/1,768,865.48 = 420,819.21/x
  3. Step 3: Cross multiply
    1,178,994.55x = 1,768,865.48 × 420,819.21
  4. Step 4: Simplify right side
    1,178,994.55x = 744,372,573,889.87
  5. Step 5: Solve for x
    x = 744,372,573,889.87/1,178,994.55
  6. Step 6: Final answer
    x = 631,362.18

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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.