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Finding the Fourth Proportional to 128,139.60, 192,403.80 and 98,590.80

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Solution

The fourth proportional to 128,139.60, 192,403.80 and 98,590.80 is: 148,035.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,139.60 : 192,403.80 = 98,590.80 : x
  2. Step 2: Convert to fraction form
    128,139.60/192,403.80 = 98,590.80/x
  3. Step 3: Cross multiply
    128,139.60x = 192,403.80 × 98,590.80
  4. Step 4: Simplify right side
    128,139.60x = 18,969,244,565.04
  5. Step 5: Solve for x
    x = 18,969,244,565.04/128,139.60
  6. Step 6: Final answer
    x = 148,035.77

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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.