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Finding the Fourth Proportional to 64.54, 89.02 and 40.89

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Solution

The fourth proportional to 64.54, 89.02 and 40.89 is: 56.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.54 : 89.02 = 40.89 : x
  2. Step 2: Convert to fraction form
    64.54/89.02 = 40.89/x
  3. Step 3: Cross multiply
    64.54x = 89.02 × 40.89
  4. Step 4: Simplify right side
    64.54x = 3,640.03
  5. Step 5: Solve for x
    x = 3,640.03/64.54
  6. Step 6: Final answer
    x = 56.40

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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.