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Finding the Fourth Proportional to 69.88, 96.43 and 40.77

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Solution

The fourth proportional to 69.88, 96.43 and 40.77 is: 56.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.88 : 96.43 = 40.77 : x
  2. Step 2: Convert to fraction form
    69.88/96.43 = 40.77/x
  3. Step 3: Cross multiply
    69.88x = 96.43 × 40.77
  4. Step 4: Simplify right side
    69.88x = 3,931.11
  5. Step 5: Solve for x
    x = 3,931.11/69.88
  6. Step 6: Final answer
    x = 56.26

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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.