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Finding the Fourth Proportional to 1,878.62, 2,818.43 and 646.05

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Solution

The fourth proportional to 1,878.62, 2,818.43 and 646.05 is: 969.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.62 : 2,818.43 = 646.05 : x
  2. Step 2: Convert to fraction form
    1,878.62/2,818.43 = 646.05/x
  3. Step 3: Cross multiply
    1,878.62x = 2,818.43 × 646.05
  4. Step 4: Simplify right side
    1,878.62x = 1,820,840.61
  5. Step 5: Solve for x
    x = 1,820,840.61/1,878.62
  6. Step 6: Final answer
    x = 969.25

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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.