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Finding the Fourth Proportional to 388,661.88, 536,355.18 and 218,898.84

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Solution

The fourth proportional to 388,661.88, 536,355.18 and 218,898.84 is: 302,081.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,661.88 : 536,355.18 = 218,898.84 : x
  2. Step 2: Convert to fraction form
    388,661.88/536,355.18 = 218,898.84/x
  3. Step 3: Cross multiply
    388,661.88x = 536,355.18 × 218,898.84
  4. Step 4: Simplify right side
    388,661.88x = 117,407,526,729.99
  5. Step 5: Solve for x
    x = 117,407,526,729.99/388,661.88
  6. Step 6: Final answer
    x = 302,081.40

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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.