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Finding the Fourth Proportional to 64.43, 96.63 and 21.10

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Solution

The fourth proportional to 64.43, 96.63 and 21.10 is: 31.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.43 : 96.63 = 21.10 : x
  2. Step 2: Convert to fraction form
    64.43/96.63 = 21.10/x
  3. Step 3: Cross multiply
    64.43x = 96.63 × 21.10
  4. Step 4: Simplify right side
    64.43x = 2,038.89
  5. Step 5: Solve for x
    x = 2,038.89/64.43
  6. Step 6: Final answer
    x = 31.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.