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Finding the Fourth Proportional to 91,603.78, 126,412.05 and 51,316.81

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Solution

The fourth proportional to 91,603.78, 126,412.05 and 51,316.81 is: 70,816.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,603.78 : 126,412.05 = 51,316.81 : x
  2. Step 2: Convert to fraction form
    91,603.78/126,412.05 = 51,316.81/x
  3. Step 3: Cross multiply
    91,603.78x = 126,412.05 × 51,316.81
  4. Step 4: Simplify right side
    91,603.78x = 6,487,063,151.56
  5. Step 5: Solve for x
    x = 6,487,063,151.56/91,603.78
  6. Step 6: Final answer
    x = 70,816.54

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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.