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Finding the Fourth Proportional to 127.61, 190.93 and 78.21

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Solution

The fourth proportional to 127.61, 190.93 and 78.21 is: 117.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.61 : 190.93 = 78.21 : x
  2. Step 2: Convert to fraction form
    127.61/190.93 = 78.21/x
  3. Step 3: Cross multiply
    127.61x = 190.93 × 78.21
  4. Step 4: Simplify right side
    127.61x = 14,931.29
  5. Step 5: Solve for x
    x = 14,931.29/127.61
  6. Step 6: Final answer
    x = 117.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.