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Finding the Fourth Proportional to 918,647, 1,377,881.40 and 278,956.28

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Solution

The fourth proportional to 918,647, 1,377,881.40 and 278,956.28 is: 418,407.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,647 : 1,377,881.40 = 278,956.28 : x
  2. Step 2: Convert to fraction form
    918,647/1,377,881.40 = 278,956.28/x
  3. Step 3: Cross multiply
    918,647x = 1,377,881.40 × 278,956.28
  4. Step 4: Simplify right side
    918,647x = 384,368,669,625.19
  5. Step 5: Solve for x
    x = 384,368,669,625.19/918,647
  6. Step 6: Final answer
    x = 418,407.36

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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.