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Finding the Fourth Proportional to 432,078.80, 648,118.20 and 420,414.80

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Solution

The fourth proportional to 432,078.80, 648,118.20 and 420,414.80 is: 630,622.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    432,078.80 : 648,118.20 = 420,414.80 : x
  2. Step 2: Convert to fraction form
    432,078.80/648,118.20 = 420,414.80/x
  3. Step 3: Cross multiply
    432,078.80x = 648,118.20 × 420,414.80
  4. Step 4: Simplify right side
    432,078.80x = 272,478,483,429.36
  5. Step 5: Solve for x
    x = 272,478,483,429.36/432,078.80
  6. Step 6: Final answer
    x = 630,622.20

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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.