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Finding the Fourth Proportional to 66.63, 100.45 and 57.08

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Solution

The fourth proportional to 66.63, 100.45 and 57.08 is: 86.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.63 : 100.45 = 57.08 : x
  2. Step 2: Convert to fraction form
    66.63/100.45 = 57.08/x
  3. Step 3: Cross multiply
    66.63x = 100.45 × 57.08
  4. Step 4: Simplify right side
    66.63x = 5,733.12
  5. Step 5: Solve for x
    x = 5,733.12/66.63
  6. Step 6: Final answer
    x = 86.05

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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.