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Finding the Fourth Proportional to 548,404.40, 821,002.80 and 390,940.40

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Solution

The fourth proportional to 548,404.40, 821,002.80 and 390,940.40 is: 585,267.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    548,404.40 : 821,002.80 = 390,940.40 : x
  2. Step 2: Convert to fraction form
    548,404.40/821,002.80 = 390,940.40/x
  3. Step 3: Cross multiply
    548,404.40x = 821,002.80 × 390,940.40
  4. Step 4: Simplify right side
    548,404.40x = 320,963,163,033.12
  5. Step 5: Solve for x
    x = 320,963,163,033.12/548,404.40
  6. Step 6: Final answer
    x = 585,267.30

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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.