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Finding the Fourth Proportional to 2,810.66, 4,215.62 and 862.70

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Solution

The fourth proportional to 2,810.66, 4,215.62 and 862.70 is: 1,293.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,810.66 : 4,215.62 = 862.70 : x
  2. Step 2: Convert to fraction form
    2,810.66/4,215.62 = 862.70/x
  3. Step 3: Cross multiply
    2,810.66x = 4,215.62 × 862.70
  4. Step 4: Simplify right side
    2,810.66x = 3,636,789.98
  5. Step 5: Solve for x
    x = 3,636,789.98/2,810.66
  6. Step 6: Final answer
    x = 1,293.93

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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.