Home / 638,810,107.20-958,215,160.80-420,706,720.80

Finding the Fourth Proportional to 638,810,107.20, 958,215,160.80 and 420,706,720.80

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Solution

The fourth proportional to 638,810,107.20, 958,215,160.80 and 420,706,720.80 is: 631,060,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,810,107.20 : 958,215,160.80 = 420,706,720.80 : x
  2. Step 2: Convert to fraction form
    638,810,107.20/958,215,160.80 = 420,706,720.80/x
  3. Step 3: Cross multiply
    638,810,107.20x = 958,215,160.80 × 420,706,720.80
  4. Step 4: Simplify right side
    638,810,107.20x = 403,127,558,121,012,672
  5. Step 5: Solve for x
    x = 403,127,558,121,012,672/638,810,107.20
  6. Step 6: Final answer
    x = 631,060,081.20

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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.