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Finding the Fourth Proportional to 408,009.20, 612,013.80 and 380,015.60

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Solution

The fourth proportional to 408,009.20, 612,013.80 and 380,015.60 is: 570,023.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,009.20 : 612,013.80 = 380,015.60 : x
  2. Step 2: Convert to fraction form
    408,009.20/612,013.80 = 380,015.60/x
  3. Step 3: Cross multiply
    408,009.20x = 612,013.80 × 380,015.60
  4. Step 4: Simplify right side
    408,009.20x = 232,574,791,415.28
  5. Step 5: Solve for x
    x = 232,574,791,415.28/408,009.20
  6. Step 6: Final answer
    x = 570,023.40

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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.