Home / 1,298.42-1,948.40-518.80

Finding the Fourth Proportional to 1,298.42, 1,948.40 and 518.80

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Solution

The fourth proportional to 1,298.42, 1,948.40 and 518.80 is: 778.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.42 : 1,948.40 = 518.80 : x
  2. Step 2: Convert to fraction form
    1,298.42/1,948.40 = 518.80/x
  3. Step 3: Cross multiply
    1,298.42x = 1,948.40 × 518.80
  4. Step 4: Simplify right side
    1,298.42x = 1,010,829.92
  5. Step 5: Solve for x
    x = 1,010,829.92/1,298.42
  6. Step 6: Final answer
    x = 778.51

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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.