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Finding the Fourth Proportional to 91,138, 125,775.30 and 53,424.40

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Solution

The fourth proportional to 91,138, 125,775.30 and 53,424.40 is: 73,728.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,138 : 125,775.30 = 53,424.40 : x
  2. Step 2: Convert to fraction form
    91,138/125,775.30 = 53,424.40/x
  3. Step 3: Cross multiply
    91,138x = 125,775.30 × 53,424.40
  4. Step 4: Simplify right side
    91,138x = 6,719,469,937.32
  5. Step 5: Solve for x
    x = 6,719,469,937.32/91,138
  6. Step 6: Final answer
    x = 73,728.52

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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.