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Finding the Fourth Proportional to 51,211, 70,672.28 and 28,855

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Solution

The fourth proportional to 51,211, 70,672.28 and 28,855 is: 39,820.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,211 : 70,672.28 = 28,855 : x
  2. Step 2: Convert to fraction form
    51,211/70,672.28 = 28,855/x
  3. Step 3: Cross multiply
    51,211x = 70,672.28 × 28,855
  4. Step 4: Simplify right side
    51,211x = 2,039,248,639.40
  5. Step 5: Solve for x
    x = 2,039,248,639.40/51,211
  6. Step 6: Final answer
    x = 39,820.52

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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.