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Finding the Fourth Proportional to 105.30, 157.80 and 92.40

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Solution

The fourth proportional to 105.30, 157.80 and 92.40 is: 138.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.30 : 157.80 = 92.40 : x
  2. Step 2: Convert to fraction form
    105.30/157.80 = 92.40/x
  3. Step 3: Cross multiply
    105.30x = 157.80 × 92.40
  4. Step 4: Simplify right side
    105.30x = 14,580.72
  5. Step 5: Solve for x
    x = 14,580.72/105.30
  6. Step 6: Final answer
    x = 138.47

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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.