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Finding the Fourth Proportional to 155.40, 214.50 and 102.98

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Solution

The fourth proportional to 155.40, 214.50 and 102.98 is: 142.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.40 : 214.50 = 102.98 : x
  2. Step 2: Convert to fraction form
    155.40/214.50 = 102.98/x
  3. Step 3: Cross multiply
    155.40x = 214.50 × 102.98
  4. Step 4: Simplify right side
    155.40x = 22,089.21
  5. Step 5: Solve for x
    x = 22,089.21/155.40
  6. Step 6: Final answer
    x = 142.14

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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.