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Finding the Fourth Proportional to 1,282.55, 1,771.70 and 991.53

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Solution

The fourth proportional to 1,282.55, 1,771.70 and 991.53 is: 1,369.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.55 : 1,771.70 = 991.53 : x
  2. Step 2: Convert to fraction form
    1,282.55/1,771.70 = 991.53/x
  3. Step 3: Cross multiply
    1,282.55x = 1,771.70 × 991.53
  4. Step 4: Simplify right side
    1,282.55x = 1,756,688.74
  5. Step 5: Solve for x
    x = 1,756,688.74/1,282.55
  6. Step 6: Final answer
    x = 1,369.69

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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.