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Finding the Fourth Proportional to 1,298.79, 1,948.19 and 518.74

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Solution

The fourth proportional to 1,298.79, 1,948.19 and 518.74 is: 778.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.79 : 1,948.19 = 518.74 : x
  2. Step 2: Convert to fraction form
    1,298.79/1,948.19 = 518.74/x
  3. Step 3: Cross multiply
    1,298.79x = 1,948.19 × 518.74
  4. Step 4: Simplify right side
    1,298.79x = 1,010,596.62
  5. Step 5: Solve for x
    x = 1,010,596.62/1,298.79
  6. Step 6: Final answer
    x = 778.11

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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.