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Finding the Fourth Proportional to 258,491.93, 387,738.02 and 81,012.76

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Solution

The fourth proportional to 258,491.93, 387,738.02 and 81,012.76 is: 121,519.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,491.93 : 387,738.02 = 81,012.76 : x
  2. Step 2: Convert to fraction form
    258,491.93/387,738.02 = 81,012.76/x
  3. Step 3: Cross multiply
    258,491.93x = 387,738.02 × 81,012.76
  4. Step 4: Simplify right side
    258,491.93x = 31,411,726,390.32
  5. Step 5: Solve for x
    x = 31,411,726,390.32/258,491.93
  6. Step 6: Final answer
    x = 121,519.18

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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.