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Finding the Fourth Proportional to 318,143.95, 438,992.94 and 187,243.76

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Solution

The fourth proportional to 318,143.95, 438,992.94 and 187,243.76 is: 258,369.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,143.95 : 438,992.94 = 187,243.76 : x
  2. Step 2: Convert to fraction form
    318,143.95/438,992.94 = 187,243.76/x
  3. Step 3: Cross multiply
    318,143.95x = 438,992.94 × 187,243.76
  4. Step 4: Simplify right side
    318,143.95x = 82,198,689,796.54
  5. Step 5: Solve for x
    x = 82,198,689,796.54/318,143.95
  6. Step 6: Final answer
    x = 258,369.49

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1.5x scale

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.