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Finding the Fourth Proportional to 121,216.40, 181,824.60 and 68,728.40

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Solution

The fourth proportional to 121,216.40, 181,824.60 and 68,728.40 is: 103,092.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,216.40 : 181,824.60 = 68,728.40 : x
  2. Step 2: Convert to fraction form
    121,216.40/181,824.60 = 68,728.40/x
  3. Step 3: Cross multiply
    121,216.40x = 181,824.60 × 68,728.40
  4. Step 4: Simplify right side
    121,216.40x = 12,496,513,838.64
  5. Step 5: Solve for x
    x = 12,496,513,838.64/121,216.40
  6. Step 6: Final answer
    x = 103,092.60

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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.