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Finding the Fourth Proportional to 91,164, 125,810.64 and 51,420

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Solution

The fourth proportional to 91,164, 125,810.64 and 51,420 is: 70,962.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,164 : 125,810.64 = 51,420 : x
  2. Step 2: Convert to fraction form
    91,164/125,810.64 = 51,420/x
  3. Step 3: Cross multiply
    91,164x = 125,810.64 × 51,420
  4. Step 4: Simplify right side
    91,164x = 6,469,183,108.80
  5. Step 5: Solve for x
    x = 6,469,183,108.80/91,164
  6. Step 6: Final answer
    x = 70,962.04

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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.