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Finding the Fourth Proportional to 390,013.20, 585,019.80 and 222,051.60

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Solution

The fourth proportional to 390,013.20, 585,019.80 and 222,051.60 is: 333,077.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,013.20 : 585,019.80 = 222,051.60 : x
  2. Step 2: Convert to fraction form
    390,013.20/585,019.80 = 222,051.60/x
  3. Step 3: Cross multiply
    390,013.20x = 585,019.80 × 222,051.60
  4. Step 4: Simplify right side
    390,013.20x = 129,904,582,621.68
  5. Step 5: Solve for x
    x = 129,904,582,621.68/390,013.20
  6. Step 6: Final answer
    x = 333,077.40

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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.