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Finding the Fourth Proportional to 912,115, 1,368,393.95 and 281,028.79

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Solution

The fourth proportional to 912,115, 1,368,393.95 and 281,028.79 is: 421,611.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    912,115 : 1,368,393.95 = 281,028.79 : x
  2. Step 2: Convert to fraction form
    912,115/1,368,393.95 = 281,028.79/x
  3. Step 3: Cross multiply
    912,115x = 1,368,393.95 × 281,028.79
  4. Step 4: Simplify right side
    912,115x = 384,558,096,011.82
  5. Step 5: Solve for x
    x = 384,558,096,011.82/912,115
  6. Step 6: Final answer
    x = 421,611.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.