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Finding the Fourth Proportional to 1,246.90, 1,869.71 and 698.93

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Solution

The fourth proportional to 1,246.90, 1,869.71 and 698.93 is: 1,048.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.90 : 1,869.71 = 698.93 : x
  2. Step 2: Convert to fraction form
    1,246.90/1,869.71 = 698.93/x
  3. Step 3: Cross multiply
    1,246.90x = 1,869.71 × 698.93
  4. Step 4: Simplify right side
    1,246.90x = 1,306,792.92
  5. Step 5: Solve for x
    x = 1,306,792.92/1,246.90
  6. Step 6: Final answer
    x = 1,048.04

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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.