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Finding the Fourth Proportional to 95.42, 143.64 and 85.50

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Solution

The fourth proportional to 95.42, 143.64 and 85.50 is: 128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.42 : 143.64 = 85.50 : x
  2. Step 2: Convert to fraction form
    95.42/143.64 = 85.50/x
  3. Step 3: Cross multiply
    95.42x = 143.64 × 85.50
  4. Step 4: Simplify right side
    95.42x = 12,281.22
  5. Step 5: Solve for x
    x = 12,281.22/95.42
  6. Step 6: Final answer
    x = 128.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.