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Finding the Fourth Proportional to 128,058.58, 176,743.98 and 76,379.00

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Solution

The fourth proportional to 128,058.58, 176,743.98 and 76,379.00 is: 105,416.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,058.58 : 176,743.98 = 76,379.00 : x
  2. Step 2: Convert to fraction form
    128,058.58/176,743.98 = 76,379.00/x
  3. Step 3: Cross multiply
    128,058.58x = 176,743.98 × 76,379.00
  4. Step 4: Simplify right side
    128,058.58x = 13,499,527,564.70
  5. Step 5: Solve for x
    x = 13,499,527,564.70/128,058.58
  6. Step 6: Final answer
    x = 105,416.81

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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.