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Finding the Fourth Proportional to 100.63, 151.61 and 91.01

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Solution

The fourth proportional to 100.63, 151.61 and 91.01 is: 137.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.63 : 151.61 = 91.01 : x
  2. Step 2: Convert to fraction form
    100.63/151.61 = 91.01/x
  3. Step 3: Cross multiply
    100.63x = 151.61 × 91.01
  4. Step 4: Simplify right side
    100.63x = 13,798.63
  5. Step 5: Solve for x
    x = 13,798.63/100.63
  6. Step 6: Final answer
    x = 137.13

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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.