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Finding the Fourth Proportional to 64.65, 96.98 and 47.50

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Solution

The fourth proportional to 64.65, 96.98 and 47.50 is: 71.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.65 : 96.98 = 47.50 : x
  2. Step 2: Convert to fraction form
    64.65/96.98 = 47.50/x
  3. Step 3: Cross multiply
    64.65x = 96.98 × 47.50
  4. Step 4: Simplify right side
    64.65x = 4,606.55
  5. Step 5: Solve for x
    x = 4,606.55/64.65
  6. Step 6: Final answer
    x = 71.25

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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.