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Finding the Fourth Proportional to 388,861.40, 536,628.62 and 210,013.40

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Solution

The fourth proportional to 388,861.40, 536,628.62 and 210,013.40 is: 289,818.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,861.40 : 536,628.62 = 210,013.40 : x
  2. Step 2: Convert to fraction form
    388,861.40/536,628.62 = 210,013.40/x
  3. Step 3: Cross multiply
    388,861.40x = 536,628.62 × 210,013.40
  4. Step 4: Simplify right side
    388,861.40x = 112,699,201,023.51
  5. Step 5: Solve for x
    x = 112,699,201,023.51/388,861.40
  6. Step 6: Final answer
    x = 289,818.43

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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.