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Finding the Fourth Proportional to 388,274.78, 535,730.55 and 218,446.94

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Solution

The fourth proportional to 388,274.78, 535,730.55 and 218,446.94 is: 301,406.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,274.78 : 535,730.55 = 218,446.94 : x
  2. Step 2: Convert to fraction form
    388,274.78/535,730.55 = 218,446.94/x
  3. Step 3: Cross multiply
    388,274.78x = 535,730.55 × 218,446.94
  4. Step 4: Simplify right side
    388,274.78x = 117,028,699,312.02
  5. Step 5: Solve for x
    x = 117,028,699,312.02/388,274.78
  6. Step 6: Final answer
    x = 301,406.90

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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.