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Finding the Fourth Proportional to 390,323.44, 585,082.36 and 190,396.72

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Solution

The fourth proportional to 390,323.44, 585,082.36 and 190,396.72 is: 285,398.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,323.44 : 585,082.36 = 190,396.72 : x
  2. Step 2: Convert to fraction form
    390,323.44/585,082.36 = 190,396.72/x
  3. Step 3: Cross multiply
    390,323.44x = 585,082.36 × 190,396.72
  4. Step 4: Simplify right side
    390,323.44x = 111,397,762,273.86
  5. Step 5: Solve for x
    x = 111,397,762,273.86/390,323.44
  6. Step 6: Final answer
    x = 285,398.60

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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.