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Finding the Fourth Proportional to 412,825.20, 619,237.80 and 390,015.60

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Solution

The fourth proportional to 412,825.20, 619,237.80 and 390,015.60 is: 585,023.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    412,825.20 : 619,237.80 = 390,015.60 : x
  2. Step 2: Convert to fraction form
    412,825.20/619,237.80 = 390,015.60/x
  3. Step 3: Cross multiply
    412,825.20x = 619,237.80 × 390,015.60
  4. Step 4: Simplify right side
    412,825.20x = 241,512,402,109.68
  5. Step 5: Solve for x
    x = 241,512,402,109.68/412,825.20
  6. Step 6: Final answer
    x = 585,023.40

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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.