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Finding the Fourth Proportional to 839.71, 1,256.87 and 448.73

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Solution

The fourth proportional to 839.71, 1,256.87 and 448.73 is: 671.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.71 : 1,256.87 = 448.73 : x
  2. Step 2: Convert to fraction form
    839.71/1,256.87 = 448.73/x
  3. Step 3: Cross multiply
    839.71x = 1,256.87 × 448.73
  4. Step 4: Simplify right side
    839.71x = 563,995.84
  5. Step 5: Solve for x
    x = 563,995.84/839.71
  6. Step 6: Final answer
    x = 671.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.