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Finding the Fourth Proportional to 189.40, 259.90 and 187.58

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Solution

The fourth proportional to 189.40, 259.90 and 187.58 is: 257.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.40 : 259.90 = 187.58 : x
  2. Step 2: Convert to fraction form
    189.40/259.90 = 187.58/x
  3. Step 3: Cross multiply
    189.40x = 259.90 × 187.58
  4. Step 4: Simplify right side
    189.40x = 48,752.04
  5. Step 5: Solve for x
    x = 48,752.04/189.40
  6. Step 6: Final answer
    x = 257.40

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.