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Finding the Fourth Proportional to 1,119.90, 1,679.85 and 810.30

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Solution

The fourth proportional to 1,119.90, 1,679.85 and 810.30 is: 1,215.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.90 : 1,679.85 = 810.30 : x
  2. Step 2: Convert to fraction form
    1,119.90/1,679.85 = 810.30/x
  3. Step 3: Cross multiply
    1,119.90x = 1,679.85 × 810.30
  4. Step 4: Simplify right side
    1,119.90x = 1,361,182.46
  5. Step 5: Solve for x
    x = 1,361,182.46/1,119.90
  6. Step 6: Final answer
    x = 1,215.45

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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.