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Finding the Fourth Proportional to 289,998.90, 434,981.04 and 90,291.18

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Solution

The fourth proportional to 289,998.90, 434,981.04 and 90,291.18 is: 135,431.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,998.90 : 434,981.04 = 90,291.18 : x
  2. Step 2: Convert to fraction form
    289,998.90/434,981.04 = 90,291.18/x
  3. Step 3: Cross multiply
    289,998.90x = 434,981.04 × 90,291.18
  4. Step 4: Simplify right side
    289,998.90x = 39,274,951,379.23
  5. Step 5: Solve for x
    x = 39,274,951,379.23/289,998.90
  6. Step 6: Final answer
    x = 135,431.38

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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.