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Finding the Fourth Proportional to 91,152, 125,789.76 and 51,415.68

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Solution

The fourth proportional to 91,152, 125,789.76 and 51,415.68 is: 70,953.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,152 : 125,789.76 = 51,415.68 : x
  2. Step 2: Convert to fraction form
    91,152/125,789.76 = 51,415.68/x
  3. Step 3: Cross multiply
    91,152x = 125,789.76 × 51,415.68
  4. Step 4: Simplify right side
    91,152x = 6,467,566,047.44
  5. Step 5: Solve for x
    x = 6,467,566,047.44/91,152
  6. Step 6: Final answer
    x = 70,953.64

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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.