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Finding the Fourth Proportional to 152.62, 210.12 and 128.02

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Solution

The fourth proportional to 152.62, 210.12 and 128.02 is: 176.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.62 : 210.12 = 128.02 : x
  2. Step 2: Convert to fraction form
    152.62/210.12 = 128.02/x
  3. Step 3: Cross multiply
    152.62x = 210.12 × 128.02
  4. Step 4: Simplify right side
    152.62x = 26,899.56
  5. Step 5: Solve for x
    x = 26,899.56/152.62
  6. Step 6: Final answer
    x = 176.25

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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.