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Finding the Fourth Proportional to 388,948, 536,734.80 and 219,172

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Solution

The fourth proportional to 388,948, 536,734.80 and 219,172 is: 302,449.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,948 : 536,734.80 = 219,172 : x
  2. Step 2: Convert to fraction form
    388,948/536,734.80 = 219,172/x
  3. Step 3: Cross multiply
    388,948x = 536,734.80 × 219,172
  4. Step 4: Simplify right side
    388,948x = 117,637,239,585.60
  5. Step 5: Solve for x
    x = 117,637,239,585.60/388,948
  6. Step 6: Final answer
    x = 302,449.79

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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.