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Finding the Fourth Proportional to 153,722.51, 212,137.36 and 85,743.89

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Solution

The fourth proportional to 153,722.51, 212,137.36 and 85,743.89 is: 118,326.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,722.51 : 212,137.36 = 85,743.89 : x
  2. Step 2: Convert to fraction form
    153,722.51/212,137.36 = 85,743.89/x
  3. Step 3: Cross multiply
    153,722.51x = 212,137.36 × 85,743.89
  4. Step 4: Simplify right side
    153,722.51x = 18,189,482,236.70
  5. Step 5: Solve for x
    x = 18,189,482,236.70/153,722.51
  6. Step 6: Final answer
    x = 118,326.73

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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.