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Finding the Fourth Proportional to 1,101.78, 1,651.11 and 971.51

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Solution

The fourth proportional to 1,101.78, 1,651.11 and 971.51 is: 1,455.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.78 : 1,651.11 = 971.51 : x
  2. Step 2: Convert to fraction form
    1,101.78/1,651.11 = 971.51/x
  3. Step 3: Cross multiply
    1,101.78x = 1,651.11 × 971.51
  4. Step 4: Simplify right side
    1,101.78x = 1,604,069.88
  5. Step 5: Solve for x
    x = 1,604,069.88/1,101.78
  6. Step 6: Final answer
    x = 1,455.89

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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.