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Finding the Fourth Proportional to 1,879.34, 2,819.08 and 646.74

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Solution

The fourth proportional to 1,879.34, 2,819.08 and 646.74 is: 970.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.34 : 2,819.08 = 646.74 : x
  2. Step 2: Convert to fraction form
    1,879.34/2,819.08 = 646.74/x
  3. Step 3: Cross multiply
    1,879.34x = 2,819.08 × 646.74
  4. Step 4: Simplify right side
    1,879.34x = 1,823,210.18
  5. Step 5: Solve for x
    x = 1,823,210.18/1,879.34
  6. Step 6: Final answer
    x = 970.13

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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.