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Finding the Fourth Proportional to 426,659.20, 638,433.60 and 389,334.40

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Solution

The fourth proportional to 426,659.20, 638,433.60 and 389,334.40 is: 582,582.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,659.20 : 638,433.60 = 389,334.40 : x
  2. Step 2: Convert to fraction form
    426,659.20/638,433.60 = 389,334.40/x
  3. Step 3: Cross multiply
    426,659.20x = 638,433.60 × 389,334.40
  4. Step 4: Simplify right side
    426,659.20x = 248,564,162,595.84
  5. Step 5: Solve for x
    x = 248,564,162,595.84/426,659.20
  6. Step 6: Final answer
    x = 582,582.45

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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.