Home / 645,043.82-890,105.70-354,639.69

Finding the Fourth Proportional to 645,043.82, 890,105.70 and 354,639.69

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Solution

The fourth proportional to 645,043.82, 890,105.70 and 354,639.69 is: 489,372.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,043.82 : 890,105.70 = 354,639.69 : x
  2. Step 2: Convert to fraction form
    645,043.82/890,105.70 = 354,639.69/x
  3. Step 3: Cross multiply
    645,043.82x = 890,105.70 × 354,639.69
  4. Step 4: Simplify right side
    645,043.82x = 315,666,809,515.23
  5. Step 5: Solve for x
    x = 315,666,809,515.23/645,043.82
  6. Step 6: Final answer
    x = 489,372.66

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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.