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Finding the Fourth Proportional to 388,690.56, 536,372.28 and 218,913.84

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Solution

The fourth proportional to 388,690.56, 536,372.28 and 218,913.84 is: 302,089.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,690.56 : 536,372.28 = 218,913.84 : x
  2. Step 2: Convert to fraction form
    388,690.56/536,372.28 = 218,913.84/x
  3. Step 3: Cross multiply
    388,690.56x = 536,372.28 × 218,913.84
  4. Step 4: Simplify right side
    388,690.56x = 117,419,315,484.36
  5. Step 5: Solve for x
    x = 117,419,315,484.36/388,690.56
  6. Step 6: Final answer
    x = 302,089.44

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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.