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Finding the Fourth Proportional to 51,389.78, 70,921.19 and 28,728.87

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Solution

The fourth proportional to 51,389.78, 70,921.19 and 28,728.87 is: 39,647.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,389.78 : 70,921.19 = 28,728.87 : x
  2. Step 2: Convert to fraction form
    51,389.78/70,921.19 = 28,728.87/x
  3. Step 3: Cross multiply
    51,389.78x = 70,921.19 × 28,728.87
  4. Step 4: Simplify right side
    51,389.78x = 2,037,485,719.58
  5. Step 5: Solve for x
    x = 2,037,485,719.58/51,389.78
  6. Step 6: Final answer
    x = 39,647.68

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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.