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Finding the Fourth Proportional to 1,985.90, 2,979.66 and 889.52

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Solution

The fourth proportional to 1,985.90, 2,979.66 and 889.52 is: 1,334.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.90 : 2,979.66 = 889.52 : x
  2. Step 2: Convert to fraction form
    1,985.90/2,979.66 = 889.52/x
  3. Step 3: Cross multiply
    1,985.90x = 2,979.66 × 889.52
  4. Step 4: Simplify right side
    1,985.90x = 2,650,467.16
  5. Step 5: Solve for x
    x = 2,650,467.16/1,985.90
  6. Step 6: Final answer
    x = 1,334.64

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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.