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Finding the Fourth Proportional to 390,911.74, 539,412.69 and 218,839.12

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Solution

The fourth proportional to 390,911.74, 539,412.69 and 218,839.12 is: 301,972.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,911.74 : 539,412.69 = 218,839.12 : x
  2. Step 2: Convert to fraction form
    390,911.74/539,412.69 = 218,839.12/x
  3. Step 3: Cross multiply
    390,911.74x = 539,412.69 × 218,839.12
  4. Step 4: Simplify right side
    390,911.74x = 118,044,598,396.43
  5. Step 5: Solve for x
    x = 118,044,598,396.43/390,911.74
  6. Step 6: Final answer
    x = 301,972.51

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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.