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Finding the Fourth Proportional to 417.50, 626.35 and 143.51

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Solution

The fourth proportional to 417.50, 626.35 and 143.51 is: 215.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.50 : 626.35 = 143.51 : x
  2. Step 2: Convert to fraction form
    417.50/626.35 = 143.51/x
  3. Step 3: Cross multiply
    417.50x = 626.35 × 143.51
  4. Step 4: Simplify right side
    417.50x = 89,888.70
  5. Step 5: Solve for x
    x = 89,888.70/417.50
  6. Step 6: Final answer
    x = 215.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.