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Finding the Fourth Proportional to 91,409.20, 136,822.20 and 71,580.40

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Solution

The fourth proportional to 91,409.20, 136,822.20 and 71,580.40 is: 107,142.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,409.20 : 136,822.20 = 71,580.40 : x
  2. Step 2: Convert to fraction form
    91,409.20/136,822.20 = 71,580.40/x
  3. Step 3: Cross multiply
    91,409.20x = 136,822.20 × 71,580.40
  4. Step 4: Simplify right side
    91,409.20x = 9,793,787,804.88
  5. Step 5: Solve for x
    x = 9,793,787,804.88/91,409.20
  6. Step 6: Final answer
    x = 107,142.25

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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.