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Finding the Fourth Proportional to 102.54, 141.40 and 65.70

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Solution

The fourth proportional to 102.54, 141.40 and 65.70 is: 90.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.54 : 141.40 = 65.70 : x
  2. Step 2: Convert to fraction form
    102.54/141.40 = 65.70/x
  3. Step 3: Cross multiply
    102.54x = 141.40 × 65.70
  4. Step 4: Simplify right side
    102.54x = 9,289.65
  5. Step 5: Solve for x
    x = 9,289.65/102.54
  6. Step 6: Final answer
    x = 90.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.