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Finding the Fourth Proportional to 411,839.20, 616,981.20 and 211,477.60

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Solution

The fourth proportional to 411,839.20, 616,981.20 and 211,477.60 is: 316,817.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,839.20 : 616,981.20 = 211,477.60 : x
  2. Step 2: Convert to fraction form
    411,839.20/616,981.20 = 211,477.60/x
  3. Step 3: Cross multiply
    411,839.20x = 616,981.20 × 211,477.60
  4. Step 4: Simplify right side
    411,839.20x = 130,477,703,421.12
  5. Step 5: Solve for x
    x = 130,477,703,421.12/411,839.20
  6. Step 6: Final answer
    x = 316,817.11

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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.