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Finding the Fourth Proportional to 1,880.78, 2,821.42 and 647.86

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Solution

The fourth proportional to 1,880.78, 2,821.42 and 647.86 is: 971.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,880.78 : 2,821.42 = 647.86 : x
  2. Step 2: Convert to fraction form
    1,880.78/2,821.42 = 647.86/x
  3. Step 3: Cross multiply
    1,880.78x = 2,821.42 × 647.86
  4. Step 4: Simplify right side
    1,880.78x = 1,827,887.26
  5. Step 5: Solve for x
    x = 1,827,887.26/1,880.78
  6. Step 6: Final answer
    x = 971.88

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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.