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Finding the Fourth Proportional to 152.89, 210.79 and 128

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Solution

The fourth proportional to 152.89, 210.79 and 128 is: 176.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.89 : 210.79 = 128 : x
  2. Step 2: Convert to fraction form
    152.89/210.79 = 128/x
  3. Step 3: Cross multiply
    152.89x = 210.79 × 128
  4. Step 4: Simplify right side
    152.89x = 26,981.12
  5. Step 5: Solve for x
    x = 26,981.12/152.89
  6. Step 6: Final answer
    x = 176.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.