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Finding the Fourth Proportional to 389,419.50, 537,398.94 and 210,571.50

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Solution

The fourth proportional to 389,419.50, 537,398.94 and 210,571.50 is: 290,588.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,419.50 : 537,398.94 = 210,571.50 : x
  2. Step 2: Convert to fraction form
    389,419.50/537,398.94 = 210,571.50/x
  3. Step 3: Cross multiply
    389,419.50x = 537,398.94 × 210,571.50
  4. Step 4: Simplify right side
    389,419.50x = 113,160,900,894.21
  5. Step 5: Solve for x
    x = 113,160,900,894.21/389,419.50
  6. Step 6: Final answer
    x = 290,588.69

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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.