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Finding the Fourth Proportional to 152.65, 228.51 and 128.15

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Solution

The fourth proportional to 152.65, 228.51 and 128.15 is: 191.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.65 : 228.51 = 128.15 : x
  2. Step 2: Convert to fraction form
    152.65/228.51 = 128.15/x
  3. Step 3: Cross multiply
    152.65x = 228.51 × 128.15
  4. Step 4: Simplify right side
    152.65x = 29,282.41
  5. Step 5: Solve for x
    x = 29,282.41/152.65
  6. Step 6: Final answer
    x = 191.83

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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.