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Finding the Fourth Proportional to 64.95, 89.61 and 40.35

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Solution

The fourth proportional to 64.95, 89.61 and 40.35 is: 55.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.95 : 89.61 = 40.35 : x
  2. Step 2: Convert to fraction form
    64.95/89.61 = 40.35/x
  3. Step 3: Cross multiply
    64.95x = 89.61 × 40.35
  4. Step 4: Simplify right side
    64.95x = 3,615.44
  5. Step 5: Solve for x
    x = 3,615.44/64.95
  6. Step 6: Final answer
    x = 55.66

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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.