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Finding the Fourth Proportional to 99.99, 150.75 and 91.08

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Solution

The fourth proportional to 99.99, 150.75 and 91.08 is: 137.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.99 : 150.75 = 91.08 : x
  2. Step 2: Convert to fraction form
    99.99/150.75 = 91.08/x
  3. Step 3: Cross multiply
    99.99x = 150.75 × 91.08
  4. Step 4: Simplify right side
    99.99x = 13,730.31
  5. Step 5: Solve for x
    x = 13,730.31/99.99
  6. Step 6: Final answer
    x = 137.32

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.