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Finding the Fourth Proportional to 104.02, 143.30 and 85.70

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Solution

The fourth proportional to 104.02, 143.30 and 85.70 is: 118.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.02 : 143.30 = 85.70 : x
  2. Step 2: Convert to fraction form
    104.02/143.30 = 85.70/x
  3. Step 3: Cross multiply
    104.02x = 143.30 × 85.70
  4. Step 4: Simplify right side
    104.02x = 12,281.38
  5. Step 5: Solve for x
    x = 12,281.38/104.02
  6. Step 6: Final answer
    x = 118.07

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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.