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Finding the Fourth Proportional to 65.69, 90.71 and 45.05

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Solution

The fourth proportional to 65.69, 90.71 and 45.05 is: 62.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.69 : 90.71 = 45.05 : x
  2. Step 2: Convert to fraction form
    65.69/90.71 = 45.05/x
  3. Step 3: Cross multiply
    65.69x = 90.71 × 45.05
  4. Step 4: Simplify right side
    65.69x = 4,086.14
  5. Step 5: Solve for x
    x = 4,086.14/65.69
  6. Step 6: Final answer
    x = 62.21

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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.