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Finding the Fourth Proportional to 128,407.60, 192,830.10 and 84,230.20

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Solution

The fourth proportional to 128,407.60, 192,830.10 and 84,230.20 is: 126,488.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,407.60 : 192,830.10 = 84,230.20 : x
  2. Step 2: Convert to fraction form
    128,407.60/192,830.10 = 84,230.20/x
  3. Step 3: Cross multiply
    128,407.60x = 192,830.10 × 84,230.20
  4. Step 4: Simplify right side
    128,407.60x = 16,242,117,889.02
  5. Step 5: Solve for x
    x = 16,242,117,889.02/128,407.60
  6. Step 6: Final answer
    x = 126,488.76

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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.