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Finding the Fourth Proportional to 102.09, 152.31 and 91.83

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Solution

The fourth proportional to 102.09, 152.31 and 91.83 is: 137.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.09 : 152.31 = 91.83 : x
  2. Step 2: Convert to fraction form
    102.09/152.31 = 91.83/x
  3. Step 3: Cross multiply
    102.09x = 152.31 × 91.83
  4. Step 4: Simplify right side
    102.09x = 13,986.63
  5. Step 5: Solve for x
    x = 13,986.63/102.09
  6. Step 6: Final answer
    x = 137.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.