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Finding the Fourth Proportional to 127.10, 189.40 and 123.58

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Solution

The fourth proportional to 127.10, 189.40 and 123.58 is: 184.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.10 : 189.40 = 123.58 : x
  2. Step 2: Convert to fraction form
    127.10/189.40 = 123.58/x
  3. Step 3: Cross multiply
    127.10x = 189.40 × 123.58
  4. Step 4: Simplify right side
    127.10x = 23,404.49
  5. Step 5: Solve for x
    x = 23,404.49/127.10
  6. Step 6: Final answer
    x = 184.15

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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.