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Finding the Fourth Proportional to 91,763.10, 128,205.90 and 91,763.10

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Solution

The fourth proportional to 91,763.10, 128,205.90 and 91,763.10 is: 128,205.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,763.10 : 128,205.90 = 91,763.10 : x
  2. Step 2: Convert to fraction form
    91,763.10/128,205.90 = 91,763.10/x
  3. Step 3: Cross multiply
    91,763.10x = 128,205.90 × 91,763.10
  4. Step 4: Simplify right side
    91,763.10x = 11,764,570,822.29
  5. Step 5: Solve for x
    x = 11,764,570,822.29/91,763.10
  6. Step 6: Final answer
    x = 128,205.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.