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Finding the Fourth Proportional to 1,397,431.65, 1,929,919.59 and 962,978.67

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Solution

The fourth proportional to 1,397,431.65, 1,929,919.59 and 962,978.67 is: 1,329,919.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397,431.65 : 1,929,919.59 = 962,978.67 : x
  2. Step 2: Convert to fraction form
    1,397,431.65/1,929,919.59 = 962,978.67/x
  3. Step 3: Cross multiply
    1,397,431.65x = 1,929,919.59 × 962,978.67
  4. Step 4: Simplify right side
    1,397,431.65x = 1,858,471,399,985.15
  5. Step 5: Solve for x
    x = 1,858,471,399,985.15/1,397,431.65
  6. Step 6: Final answer
    x = 1,329,919.36

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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.