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Finding the Fourth Proportional to 1,879.74, 2,818.70 and 646.72

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Solution

The fourth proportional to 1,879.74, 2,818.70 and 646.72 is: 969.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.74 : 2,818.70 = 646.72 : x
  2. Step 2: Convert to fraction form
    1,879.74/2,818.70 = 646.72/x
  3. Step 3: Cross multiply
    1,879.74x = 2,818.70 × 646.72
  4. Step 4: Simplify right side
    1,879.74x = 1,822,909.66
  5. Step 5: Solve for x
    x = 1,822,909.66/1,879.74
  6. Step 6: Final answer
    x = 969.77

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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.