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Finding the Fourth Proportional to 139,477.68, 192,478.05 and 75,815.28

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Solution

The fourth proportional to 139,477.68, 192,478.05 and 75,815.28 is: 104,624.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,477.68 : 192,478.05 = 75,815.28 : x
  2. Step 2: Convert to fraction form
    139,477.68/192,478.05 = 75,815.28/x
  3. Step 3: Cross multiply
    139,477.68x = 192,478.05 × 75,815.28
  4. Step 4: Simplify right side
    139,477.68x = 14,592,777,254.60
  5. Step 5: Solve for x
    x = 14,592,777,254.60/139,477.68
  6. Step 6: Final answer
    x = 104,624.46

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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.