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Finding the Fourth Proportional to 59.76, 89.46 and 47.64

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Solution

The fourth proportional to 59.76, 89.46 and 47.64 is: 71.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.76 : 89.46 = 47.64 : x
  2. Step 2: Convert to fraction form
    59.76/89.46 = 47.64/x
  3. Step 3: Cross multiply
    59.76x = 89.46 × 47.64
  4. Step 4: Simplify right side
    59.76x = 4,261.87
  5. Step 5: Solve for x
    x = 4,261.87/59.76
  6. Step 6: Final answer
    x = 71.32

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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.