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Finding the Fourth Proportional to 390,792.93, 539,303.91 and 218,709.54

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Solution

The fourth proportional to 390,792.93, 539,303.91 and 218,709.54 is: 301,824.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,792.93 : 539,303.91 = 218,709.54 : x
  2. Step 2: Convert to fraction form
    390,792.93/539,303.91 = 218,709.54/x
  3. Step 3: Cross multiply
    390,792.93x = 539,303.91 × 218,709.54
  4. Step 4: Simplify right side
    390,792.93x = 117,950,910,076.30
  5. Step 5: Solve for x
    x = 117,950,910,076.30/390,792.93
  6. Step 6: Final answer
    x = 301,824.58

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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.