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Finding the Fourth Proportional to 98.64, 147.66 and 69.78

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Solution

The fourth proportional to 98.64, 147.66 and 69.78 is: 104.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.64 : 147.66 = 69.78 : x
  2. Step 2: Convert to fraction form
    98.64/147.66 = 69.78/x
  3. Step 3: Cross multiply
    98.64x = 147.66 × 69.78
  4. Step 4: Simplify right side
    98.64x = 10,303.71
  5. Step 5: Solve for x
    x = 10,303.71/98.64
  6. Step 6: Final answer
    x = 104.46

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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.