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Finding the Fourth Proportional to 674,129.88, 930,057.49 and 398,429.86

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Solution

The fourth proportional to 674,129.88, 930,057.49 and 398,429.86 is: 549,690.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    674,129.88 : 930,057.49 = 398,429.86 : x
  2. Step 2: Convert to fraction form
    674,129.88/930,057.49 = 398,429.86/x
  3. Step 3: Cross multiply
    674,129.88x = 930,057.49 × 398,429.86
  4. Step 4: Simplify right side
    674,129.88x = 370,562,675,532.65
  5. Step 5: Solve for x
    x = 370,562,675,532.65/674,129.88
  6. Step 6: Final answer
    x = 549,690.33

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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.