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Finding the Fourth Proportional to 451,685.88, 621,761.64 and 390,403.98

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Solution

The fourth proportional to 451,685.88, 621,761.64 and 390,403.98 is: 537,404.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,685.88 : 621,761.64 = 390,403.98 : x
  2. Step 2: Convert to fraction form
    451,685.88/621,761.64 = 390,403.98/x
  3. Step 3: Cross multiply
    451,685.88x = 621,761.64 × 390,403.98
  4. Step 4: Simplify right side
    451,685.88x = 242,738,218,867.33
  5. Step 5: Solve for x
    x = 242,738,218,867.33/451,685.88
  6. Step 6: Final answer
    x = 537,404.93

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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.