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Finding the Fourth Proportional to 548,622.90, 821,330.55 and 391,158.90

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Solution

The fourth proportional to 548,622.90, 821,330.55 and 391,158.90 is: 585,594.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    548,622.90 : 821,330.55 = 391,158.90 : x
  2. Step 2: Convert to fraction form
    548,622.90/821,330.55 = 391,158.90/x
  3. Step 3: Cross multiply
    548,622.90x = 821,330.55 × 391,158.90
  4. Step 4: Simplify right side
    548,622.90x = 321,270,754,474.40
  5. Step 5: Solve for x
    x = 321,270,754,474.40/548,622.90
  6. Step 6: Final answer
    x = 585,594.87

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1.5x scale

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.