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Finding the Fourth Proportional to 127.84, 190.64 and 117.40

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Solution

The fourth proportional to 127.84, 190.64 and 117.40 is: 175.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.84 : 190.64 = 117.40 : x
  2. Step 2: Convert to fraction form
    127.84/190.64 = 117.40/x
  3. Step 3: Cross multiply
    127.84x = 190.64 × 117.40
  4. Step 4: Simplify right side
    127.84x = 22,381.14
  5. Step 5: Solve for x
    x = 22,381.14/127.84
  6. Step 6: Final answer
    x = 175.07

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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.