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Finding the Fourth Proportional to 64.80, 96.88 and 47.52

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Solution

The fourth proportional to 64.80, 96.88 and 47.52 is: 71.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.80 : 96.88 = 47.52 : x
  2. Step 2: Convert to fraction form
    64.80/96.88 = 47.52/x
  3. Step 3: Cross multiply
    64.80x = 96.88 × 47.52
  4. Step 4: Simplify right side
    64.80x = 4,603.74
  5. Step 5: Solve for x
    x = 4,603.74/64.80
  6. Step 6: Final answer
    x = 71.05

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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.