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Finding the Fourth Proportional to 1,064.85, 1,597.45 and 991.48

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Solution

The fourth proportional to 1,064.85, 1,597.45 and 991.48 is: 1,487.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,064.85 : 1,597.45 = 991.48 : x
  2. Step 2: Convert to fraction form
    1,064.85/1,597.45 = 991.48/x
  3. Step 3: Cross multiply
    1,064.85x = 1,597.45 × 991.48
  4. Step 4: Simplify right side
    1,064.85x = 1,583,839.73
  5. Step 5: Solve for x
    x = 1,583,839.73/1,064.85
  6. Step 6: Final answer
    x = 1,487.38

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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.