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Finding the Fourth Proportional to 128,445.60, 192,668.40 and 78,679.20

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Solution

The fourth proportional to 128,445.60, 192,668.40 and 78,679.20 is: 118,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,445.60 : 192,668.40 = 78,679.20 : x
  2. Step 2: Convert to fraction form
    128,445.60/192,668.40 = 78,679.20/x
  3. Step 3: Cross multiply
    128,445.60x = 192,668.40 × 78,679.20
  4. Step 4: Simplify right side
    128,445.60x = 15,158,995,577.28
  5. Step 5: Solve for x
    x = 15,158,995,577.28/128,445.60
  6. Step 6: Final answer
    x = 118,018.80

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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.