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Finding the Fourth Proportional to 128,421.90, 192,790.80 and 81,036.90

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Solution

The fourth proportional to 128,421.90, 192,790.80 and 81,036.90 is: 121,655.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,421.90 : 192,790.80 = 81,036.90 : x
  2. Step 2: Convert to fraction form
    128,421.90/192,790.80 = 81,036.90/x
  3. Step 3: Cross multiply
    128,421.90x = 192,790.80 × 81,036.90
  4. Step 4: Simplify right side
    128,421.90x = 15,623,168,780.52
  5. Step 5: Solve for x
    x = 15,623,168,780.52/128,421.90
  6. Step 6: Final answer
    x = 121,655.02

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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.