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Finding the Fourth Proportional to 385,275, 531,679.50 and 251,139

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Solution

The fourth proportional to 385,275, 531,679.50 and 251,139 is: 346,571.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,275 : 531,679.50 = 251,139 : x
  2. Step 2: Convert to fraction form
    385,275/531,679.50 = 251,139/x
  3. Step 3: Cross multiply
    385,275x = 531,679.50 × 251,139
  4. Step 4: Simplify right side
    385,275x = 133,525,457,950.50
  5. Step 5: Solve for x
    x = 133,525,457,950.50/385,275
  6. Step 6: Final answer
    x = 346,571.82

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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.