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Finding the Fourth Proportional to 388,939, 583,408.50 and 126,283

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Solution

The fourth proportional to 388,939, 583,408.50 and 126,283 is: 189,424.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,939 : 583,408.50 = 126,283 : x
  2. Step 2: Convert to fraction form
    388,939/583,408.50 = 126,283/x
  3. Step 3: Cross multiply
    388,939x = 583,408.50 × 126,283
  4. Step 4: Simplify right side
    388,939x = 73,674,575,605.50
  5. Step 5: Solve for x
    x = 73,674,575,605.50/388,939
  6. Step 6: Final answer
    x = 189,424.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.