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Finding the Fourth Proportional to 679,386.52, 937,165.62 and 421,145.56

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Solution

The fourth proportional to 679,386.52, 937,165.62 and 421,145.56 is: 580,940.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,386.52 : 937,165.62 = 421,145.56 : x
  2. Step 2: Convert to fraction form
    679,386.52/937,165.62 = 421,145.56/x
  3. Step 3: Cross multiply
    679,386.52x = 937,165.62 × 421,145.56
  4. Step 4: Simplify right side
    679,386.52x = 394,683,139,847.65
  5. Step 5: Solve for x
    x = 394,683,139,847.65/679,386.52
  6. Step 6: Final answer
    x = 580,940.49

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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.