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Finding the Fourth Proportional to 1,518.79, 2,278.20 and 641.30

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Solution

The fourth proportional to 1,518.79, 2,278.20 and 641.30 is: 961.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,518.79 : 2,278.20 = 641.30 : x
  2. Step 2: Convert to fraction form
    1,518.79/2,278.20 = 641.30/x
  3. Step 3: Cross multiply
    1,518.79x = 2,278.20 × 641.30
  4. Step 4: Simplify right side
    1,518.79x = 1,461,009.66
  5. Step 5: Solve for x
    x = 1,461,009.66/1,518.79
  6. Step 6: Final answer
    x = 961.96

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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.