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Finding the Fourth Proportional to 388,857.90, 536,623.79 and 210,009.90

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Solution

The fourth proportional to 388,857.90, 536,623.79 and 210,009.90 is: 289,813.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,857.90 : 536,623.79 = 210,009.90 : x
  2. Step 2: Convert to fraction form
    388,857.90/536,623.79 = 210,009.90/x
  3. Step 3: Cross multiply
    388,857.90x = 536,623.79 × 210,009.90
  4. Step 4: Simplify right side
    388,857.90x = 112,696,308,475.52
  5. Step 5: Solve for x
    x = 112,696,308,475.52/388,857.90
  6. Step 6: Final answer
    x = 289,813.60

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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.