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Finding the Fourth Proportional to 64.32, 96.47 and 21.57

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Solution

The fourth proportional to 64.32, 96.47 and 21.57 is: 32.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.32 : 96.47 = 21.57 : x
  2. Step 2: Convert to fraction form
    64.32/96.47 = 21.57/x
  3. Step 3: Cross multiply
    64.32x = 96.47 × 21.57
  4. Step 4: Simplify right side
    64.32x = 2,080.86
  5. Step 5: Solve for x
    x = 2,080.86/64.32
  6. Step 6: Final answer
    x = 32.35

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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.