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Finding the Fourth Proportional to 612,437.65, 918,843.12 and 313,128.37

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Solution

The fourth proportional to 612,437.65, 918,843.12 and 313,128.37 is: 469,787.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,437.65 : 918,843.12 = 313,128.37 : x
  2. Step 2: Convert to fraction form
    612,437.65/918,843.12 = 313,128.37/x
  3. Step 3: Cross multiply
    612,437.65x = 918,843.12 × 313,128.37
  4. Step 4: Simplify right side
    612,437.65x = 287,715,848,451.31
  5. Step 5: Solve for x
    x = 287,715,848,451.31/612,437.65
  6. Step 6: Final answer
    x = 469,787.98

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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.