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Finding the Fourth Proportional to 91,212.90, 136,928.70 and 51,263.70

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Solution

The fourth proportional to 91,212.90, 136,928.70 and 51,263.70 is: 76,957.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,212.90 : 136,928.70 = 51,263.70 : x
  2. Step 2: Convert to fraction form
    91,212.90/136,928.70 = 51,263.70/x
  3. Step 3: Cross multiply
    91,212.90x = 136,928.70 × 51,263.70
  4. Step 4: Simplify right side
    91,212.90x = 7,019,471,798.19
  5. Step 5: Solve for x
    x = 7,019,471,798.19/91,212.90
  6. Step 6: Final answer
    x = 76,957.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.