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Finding the Fourth Proportional to 548,435.80, 821,487.30 and 455,123.80

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Solution

The fourth proportional to 548,435.80, 821,487.30 and 455,123.80 is: 681,717.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    548,435.80 : 821,487.30 = 455,123.80 : x
  2. Step 2: Convert to fraction form
    548,435.80/821,487.30 = 455,123.80/x
  3. Step 3: Cross multiply
    548,435.80x = 821,487.30 × 455,123.80
  4. Step 4: Simplify right side
    548,435.80x = 373,878,421,627.74
  5. Step 5: Solve for x
    x = 373,878,421,627.74/548,435.80
  6. Step 6: Final answer
    x = 681,717.75

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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.