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Finding the Fourth Proportional to 389,489.70, 546,072.90 and 389,489.70

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Solution

The fourth proportional to 389,489.70, 546,072.90 and 389,489.70 is: 546,072.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,489.70 : 546,072.90 = 389,489.70 : x
  2. Step 2: Convert to fraction form
    389,489.70/546,072.90 = 389,489.70/x
  3. Step 3: Cross multiply
    389,489.70x = 546,072.90 × 389,489.70
  4. Step 4: Simplify right side
    389,489.70x = 212,689,769,999.13
  5. Step 5: Solve for x
    x = 212,689,769,999.13/389,489.70
  6. Step 6: Final answer
    x = 546,072.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.