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Finding the Fourth Proportional to 636,999.70, 879,422.16 and 422,429.44

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Solution

The fourth proportional to 636,999.70, 879,422.16 and 422,429.44 is: 583,193.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,999.70 : 879,422.16 = 422,429.44 : x
  2. Step 2: Convert to fraction form
    636,999.70/879,422.16 = 422,429.44/x
  3. Step 3: Cross multiply
    636,999.70x = 879,422.16 × 422,429.44
  4. Step 4: Simplify right side
    636,999.70x = 371,493,810,572.39
  5. Step 5: Solve for x
    x = 371,493,810,572.39/636,999.70
  6. Step 6: Final answer
    x = 583,193.07

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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.