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Finding the Fourth Proportional to 99.76, 149.64 and 45.60

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Solution

The fourth proportional to 99.76, 149.64 and 45.60 is: 68.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.76 : 149.64 = 45.60 : x
  2. Step 2: Convert to fraction form
    99.76/149.64 = 45.60/x
  3. Step 3: Cross multiply
    99.76x = 149.64 × 45.60
  4. Step 4: Simplify right side
    99.76x = 6,823.58
  5. Step 5: Solve for x
    x = 6,823.58/99.76
  6. Step 6: Final answer
    x = 68.40

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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.