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Finding the Fourth Proportional to 290,021.81, 435,031.90 and 79,659.95

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Solution

The fourth proportional to 290,021.81, 435,031.90 and 79,659.95 is: 119,489.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,021.81 : 435,031.90 = 79,659.95 : x
  2. Step 2: Convert to fraction form
    290,021.81/435,031.90 = 79,659.95/x
  3. Step 3: Cross multiply
    290,021.81x = 435,031.90 × 79,659.95
  4. Step 4: Simplify right side
    290,021.81x = 34,654,617,028.10
  5. Step 5: Solve for x
    x = 34,654,617,028.10/290,021.81
  6. Step 6: Final answer
    x = 119,489.70

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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.