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Finding the Fourth Proportional to 407,620.40, 611,430.60 and 127,137.20

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Solution

The fourth proportional to 407,620.40, 611,430.60 and 127,137.20 is: 190,705.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,620.40 : 611,430.60 = 127,137.20 : x
  2. Step 2: Convert to fraction form
    407,620.40/611,430.60 = 127,137.20/x
  3. Step 3: Cross multiply
    407,620.40x = 611,430.60 × 127,137.20
  4. Step 4: Simplify right side
    407,620.40x = 77,735,574,478.32
  5. Step 5: Solve for x
    x = 77,735,574,478.32/407,620.40
  6. Step 6: Final answer
    x = 190,705.80

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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.