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Finding the Fourth Proportional to 640,939.20, 961,408.80 and 628,497.60

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Solution

The fourth proportional to 640,939.20, 961,408.80 and 628,497.60 is: 942,746.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,939.20 : 961,408.80 = 628,497.60 : x
  2. Step 2: Convert to fraction form
    640,939.20/961,408.80 = 628,497.60/x
  3. Step 3: Cross multiply
    640,939.20x = 961,408.80 × 628,497.60
  4. Step 4: Simplify right side
    640,939.20x = 604,243,123,418.88
  5. Step 5: Solve for x
    x = 604,243,123,418.88/640,939.20
  6. Step 6: Final answer
    x = 942,746.40

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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.