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Finding the Fourth Proportional to 91,967.78, 126,919.29 and 51,681.42

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Solution

The fourth proportional to 91,967.78, 126,919.29 and 51,681.42 is: 71,322.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,967.78 : 126,919.29 = 51,681.42 : x
  2. Step 2: Convert to fraction form
    91,967.78/126,919.29 = 51,681.42/x
  3. Step 3: Cross multiply
    91,967.78x = 126,919.29 × 51,681.42
  4. Step 4: Simplify right side
    91,967.78x = 6,559,369,132.59
  5. Step 5: Solve for x
    x = 6,559,369,132.59/91,967.78
  6. Step 6: Final answer
    x = 71,322.47

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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.