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Finding the Fourth Proportional to 147.18, 219.18 and 143.40

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Solution

The fourth proportional to 147.18, 219.18 and 143.40 is: 213.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.18 : 219.18 = 143.40 : x
  2. Step 2: Convert to fraction form
    147.18/219.18 = 143.40/x
  3. Step 3: Cross multiply
    147.18x = 219.18 × 143.40
  4. Step 4: Simplify right side
    147.18x = 31,430.41
  5. Step 5: Solve for x
    x = 31,430.41/147.18
  6. Step 6: Final answer
    x = 213.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.