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Finding the Fourth Proportional to 426,948.40, 640,422.60 and 131,460.40

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Solution

The fourth proportional to 426,948.40, 640,422.60 and 131,460.40 is: 197,190.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,948.40 : 640,422.60 = 131,460.40 : x
  2. Step 2: Convert to fraction form
    426,948.40/640,422.60 = 131,460.40/x
  3. Step 3: Cross multiply
    426,948.40x = 640,422.60 × 131,460.40
  4. Step 4: Simplify right side
    426,948.40x = 84,190,211,165.04
  5. Step 5: Solve for x
    x = 84,190,211,165.04/426,948.40
  6. Step 6: Final answer
    x = 197,190.60

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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.