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Finding the Fourth Proportional to 388,639.36, 536,324.16 and 218,876.48

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Solution

The fourth proportional to 388,639.36, 536,324.16 and 218,876.48 is: 302,050.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,639.36 : 536,324.16 = 218,876.48 : x
  2. Step 2: Convert to fraction form
    388,639.36/536,324.16 = 218,876.48/x
  3. Step 3: Cross multiply
    388,639.36x = 536,324.16 × 218,876.48
  4. Step 4: Simplify right side
    388,639.36x = 117,388,744,279.76
  5. Step 5: Solve for x
    x = 117,388,744,279.76/388,639.36
  6. Step 6: Final answer
    x = 302,050.58

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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.