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Finding the Fourth Proportional to 129,362.87, 178,499.60 and 74,895.64

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Solution

The fourth proportional to 129,362.87, 178,499.60 and 74,895.64 is: 103,343.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,362.87 : 178,499.60 = 74,895.64 : x
  2. Step 2: Convert to fraction form
    129,362.87/178,499.60 = 74,895.64/x
  3. Step 3: Cross multiply
    129,362.87x = 178,499.60 × 74,895.64
  4. Step 4: Simplify right side
    129,362.87x = 13,368,840,961.02
  5. Step 5: Solve for x
    x = 13,368,840,961.02/129,362.87
  6. Step 6: Final answer
    x = 103,343.72

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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.