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Finding the Fourth Proportional to 91,142.40, 136,713.60 and 28,812.90

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Solution

The fourth proportional to 91,142.40, 136,713.60 and 28,812.90 is: 43,219.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,142.40 : 136,713.60 = 28,812.90 : x
  2. Step 2: Convert to fraction form
    91,142.40/136,713.60 = 28,812.90/x
  3. Step 3: Cross multiply
    91,142.40x = 136,713.60 × 28,812.90
  4. Step 4: Simplify right side
    91,142.40x = 3,939,115,285.44
  5. Step 5: Solve for x
    x = 3,939,115,285.44/91,142.40
  6. Step 6: Final answer
    x = 43,219.35

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1.5x scale

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.