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Finding the Fourth Proportional to 210.02, 289.68 and 131.28

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Solution

The fourth proportional to 210.02, 289.68 and 131.28 is: 181.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.02 : 289.68 = 131.28 : x
  2. Step 2: Convert to fraction form
    210.02/289.68 = 131.28/x
  3. Step 3: Cross multiply
    210.02x = 289.68 × 131.28
  4. Step 4: Simplify right side
    210.02x = 38,029.19
  5. Step 5: Solve for x
    x = 38,029.19/210.02
  6. Step 6: Final answer
    x = 181.07

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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.