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Finding the Fourth Proportional to 618,416.45, 855,132.59 and 490,870.61

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Solution

The fourth proportional to 618,416.45, 855,132.59 and 490,870.61 is: 678,765.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,416.45 : 855,132.59 = 490,870.61 : x
  2. Step 2: Convert to fraction form
    618,416.45/855,132.59 = 490,870.61/x
  3. Step 3: Cross multiply
    618,416.45x = 855,132.59 × 490,870.61
  4. Step 4: Simplify right side
    618,416.45x = 419,759,456,084.18
  5. Step 5: Solve for x
    x = 419,759,456,084.18/618,416.45
  6. Step 6: Final answer
    x = 678,765.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.