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Finding the Fourth Proportional to 121,920.40, 182,880.60 and 90,816.40

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Solution

The fourth proportional to 121,920.40, 182,880.60 and 90,816.40 is: 136,224.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,920.40 : 182,880.60 = 90,816.40 : x
  2. Step 2: Convert to fraction form
    121,920.40/182,880.60 = 90,816.40/x
  3. Step 3: Cross multiply
    121,920.40x = 182,880.60 × 90,816.40
  4. Step 4: Simplify right side
    121,920.40x = 16,608,557,721.84
  5. Step 5: Solve for x
    x = 16,608,557,721.84/121,920.40
  6. Step 6: Final answer
    x = 136,224.60

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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.