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Finding the Fourth Proportional to 128,320.80, 192,495.60 and 39,573.60

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Solution

The fourth proportional to 128,320.80, 192,495.60 and 39,573.60 is: 59,364.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,320.80 : 192,495.60 = 39,573.60 : x
  2. Step 2: Convert to fraction form
    128,320.80/192,495.60 = 39,573.60/x
  3. Step 3: Cross multiply
    128,320.80x = 192,495.60 × 39,573.60
  4. Step 4: Simplify right side
    128,320.80x = 7,617,743,876.16
  5. Step 5: Solve for x
    x = 7,617,743,876.16/128,320.80
  6. Step 6: Final answer
    x = 59,364.84

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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.