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Finding the Fourth Proportional to 91,897.90, 128,919.50 and 91,897.90

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Solution

The fourth proportional to 91,897.90, 128,919.50 and 91,897.90 is: 128,919.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,897.90 : 128,919.50 = 91,897.90 : x
  2. Step 2: Convert to fraction form
    91,897.90/128,919.50 = 91,897.90/x
  3. Step 3: Cross multiply
    91,897.90x = 128,919.50 × 91,897.90
  4. Step 4: Simplify right side
    91,897.90x = 11,847,431,319.05
  5. Step 5: Solve for x
    x = 11,847,431,319.05/91,897.90
  6. Step 6: Final answer
    x = 128,919.50

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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.