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Finding the Fourth Proportional to 290,403.51, 435,627.14 and 80,039.63

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Solution

The fourth proportional to 290,403.51, 435,627.14 and 80,039.63 is: 120,065.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,403.51 : 435,627.14 = 80,039.63 : x
  2. Step 2: Convert to fraction form
    290,403.51/435,627.14 = 80,039.63/x
  3. Step 3: Cross multiply
    290,403.51x = 435,627.14 × 80,039.63
  4. Step 4: Simplify right side
    290,403.51x = 34,867,432,525.22
  5. Step 5: Solve for x
    x = 34,867,432,525.22/290,403.51
  6. Step 6: Final answer
    x = 120,065.47

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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.