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Finding the Fourth Proportional to 141.51, 210.49 and 128.53

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Solution

The fourth proportional to 141.51, 210.49 and 128.53 is: 191.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.51 : 210.49 = 128.53 : x
  2. Step 2: Convert to fraction form
    141.51/210.49 = 128.53/x
  3. Step 3: Cross multiply
    141.51x = 210.49 × 128.53
  4. Step 4: Simplify right side
    141.51x = 27,054.28
  5. Step 5: Solve for x
    x = 27,054.28/141.51
  6. Step 6: Final answer
    x = 191.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.