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Finding the Fourth Proportional to 1,518.87, 2,278.35 and 478.92

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Solution

The fourth proportional to 1,518.87, 2,278.35 and 478.92 is: 718.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,518.87 : 2,278.35 = 478.92 : x
  2. Step 2: Convert to fraction form
    1,518.87/2,278.35 = 478.92/x
  3. Step 3: Cross multiply
    1,518.87x = 2,278.35 × 478.92
  4. Step 4: Simplify right side
    1,518.87x = 1,091,147.38
  5. Step 5: Solve for x
    x = 1,091,147.38/1,518.87
  6. Step 6: Final answer
    x = 718.39

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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.