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Finding the Fourth Proportional to 154,065.39, 212,590.70 and 90,379.95

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Solution

The fourth proportional to 154,065.39, 212,590.70 and 90,379.95 is: 124,712.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,065.39 : 212,590.70 = 90,379.95 : x
  2. Step 2: Convert to fraction form
    154,065.39/212,590.70 = 90,379.95/x
  3. Step 3: Cross multiply
    154,065.39x = 212,590.70 × 90,379.95
  4. Step 4: Simplify right side
    154,065.39x = 19,213,936,836.47
  5. Step 5: Solve for x
    x = 19,213,936,836.47/154,065.39
  6. Step 6: Final answer
    x = 124,712.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.