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Finding the Fourth Proportional to 390,370.20, 585,620.10 and 153,720.60

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Solution

The fourth proportional to 390,370.20, 585,620.10 and 153,720.60 is: 230,606.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,370.20 : 585,620.10 = 153,720.60 : x
  2. Step 2: Convert to fraction form
    390,370.20/585,620.10 = 153,720.60/x
  3. Step 3: Cross multiply
    390,370.20x = 585,620.10 × 153,720.60
  4. Step 4: Simplify right side
    390,370.20x = 90,021,873,144.06
  5. Step 5: Solve for x
    x = 90,021,873,144.06/390,370.20
  6. Step 6: Final answer
    x = 230,606.42

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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.