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Finding the Fourth Proportional to 918,870, 1,378,305.08 and 287,833

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Solution

The fourth proportional to 918,870, 1,378,305.08 and 287,833 is: 431,749.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,870 : 1,378,305.08 = 287,833 : x
  2. Step 2: Convert to fraction form
    918,870/1,378,305.08 = 287,833/x
  3. Step 3: Cross multiply
    918,870x = 1,378,305.08 × 287,833
  4. Step 4: Simplify right side
    918,870x = 396,721,686,091.64
  5. Step 5: Solve for x
    x = 396,721,686,091.64/918,870
  6. Step 6: Final answer
    x = 431,749.53

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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.