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Finding the Fourth Proportional to 1,551.90, 2,141.49 and 853.30

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Solution

The fourth proportional to 1,551.90, 2,141.49 and 853.30 is: 1,177.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.90 : 2,141.49 = 853.30 : x
  2. Step 2: Convert to fraction form
    1,551.90/2,141.49 = 853.30/x
  3. Step 3: Cross multiply
    1,551.90x = 2,141.49 × 853.30
  4. Step 4: Simplify right side
    1,551.90x = 1,827,333.42
  5. Step 5: Solve for x
    x = 1,827,333.42/1,551.90
  6. Step 6: Final answer
    x = 1,177.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.