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Finding the Fourth Proportional to 1,219.99, 1,683.48 and 722.55

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Solution

The fourth proportional to 1,219.99, 1,683.48 and 722.55 is: 997.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.99 : 1,683.48 = 722.55 : x
  2. Step 2: Convert to fraction form
    1,219.99/1,683.48 = 722.55/x
  3. Step 3: Cross multiply
    1,219.99x = 1,683.48 × 722.55
  4. Step 4: Simplify right side
    1,219.99x = 1,216,402.38
  5. Step 5: Solve for x
    x = 1,216,402.38/1,219.99
  6. Step 6: Final answer
    x = 997.06

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1.5x scale

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.