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Finding the Fourth Proportional to 140.32, 210.08 and 128

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Solution

The fourth proportional to 140.32, 210.08 and 128 is: 191.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.32 : 210.08 = 128 : x
  2. Step 2: Convert to fraction form
    140.32/210.08 = 128/x
  3. Step 3: Cross multiply
    140.32x = 210.08 × 128
  4. Step 4: Simplify right side
    140.32x = 26,890.24
  5. Step 5: Solve for x
    x = 26,890.24/140.32
  6. Step 6: Final answer
    x = 191.64

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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.