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Finding the Fourth Proportional to 619,830.20, 855,005.42 and 390,297.48

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Solution

The fourth proportional to 619,830.20, 855,005.42 and 390,297.48 is: 538,383.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,830.20 : 855,005.42 = 390,297.48 : x
  2. Step 2: Convert to fraction form
    619,830.20/855,005.42 = 390,297.48/x
  3. Step 3: Cross multiply
    619,830.20x = 855,005.42 × 390,297.48
  4. Step 4: Simplify right side
    619,830.20x = 333,706,460,812.34
  5. Step 5: Solve for x
    x = 333,706,460,812.34/619,830.20
  6. Step 6: Final answer
    x = 538,383.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.