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Finding the Fourth Proportional to 390,007.20, 585,010.80 and 190,455.60

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Solution

The fourth proportional to 390,007.20, 585,010.80 and 190,455.60 is: 285,683.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,007.20 : 585,010.80 = 190,455.60 : x
  2. Step 2: Convert to fraction form
    390,007.20/585,010.80 = 190,455.60/x
  3. Step 3: Cross multiply
    390,007.20x = 585,010.80 × 190,455.60
  4. Step 4: Simplify right side
    390,007.20x = 111,418,582,920.48
  5. Step 5: Solve for x
    x = 111,418,582,920.48/390,007.20
  6. Step 6: Final answer
    x = 285,683.40

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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.