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Finding the Fourth Proportional to 81,812.40, 122,718.60 and 42,446.40

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Solution

The fourth proportional to 81,812.40, 122,718.60 and 42,446.40 is: 63,669.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,812.40 : 122,718.60 = 42,446.40 : x
  2. Step 2: Convert to fraction form
    81,812.40/122,718.60 = 42,446.40/x
  3. Step 3: Cross multiply
    81,812.40x = 122,718.60 × 42,446.40
  4. Step 4: Simplify right side
    81,812.40x = 5,208,962,783.04
  5. Step 5: Solve for x
    x = 5,208,962,783.04/81,812.40
  6. Step 6: Final answer
    x = 63,669.60

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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.