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Finding the Fourth Proportional to 290,093.39, 435,143.09 and 87,691.18

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Solution

The fourth proportional to 290,093.39, 435,143.09 and 87,691.18 is: 131,537.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,093.39 : 435,143.09 = 87,691.18 : x
  2. Step 2: Convert to fraction form
    290,093.39/435,143.09 = 87,691.18/x
  3. Step 3: Cross multiply
    290,093.39x = 435,143.09 × 87,691.18
  4. Step 4: Simplify right side
    290,093.39x = 38,158,211,030.95
  5. Step 5: Solve for x
    x = 38,158,211,030.95/290,093.39
  6. Step 6: Final answer
    x = 131,537.68

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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.