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Finding the Fourth Proportional to 64.85, 89.43 and 53.90

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Solution

The fourth proportional to 64.85, 89.43 and 53.90 is: 74.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.85 : 89.43 = 53.90 : x
  2. Step 2: Convert to fraction form
    64.85/89.43 = 53.90/x
  3. Step 3: Cross multiply
    64.85x = 89.43 × 53.90
  4. Step 4: Simplify right side
    64.85x = 4,820.28
  5. Step 5: Solve for x
    x = 4,820.28/64.85
  6. Step 6: Final answer
    x = 74.33

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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.