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Finding the Fourth Proportional to 1,720.99, 2,374.11 and 1,123.20

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Solution

The fourth proportional to 1,720.99, 2,374.11 and 1,123.20 is: 1,549.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.99 : 2,374.11 = 1,123.20 : x
  2. Step 2: Convert to fraction form
    1,720.99/2,374.11 = 1,123.20/x
  3. Step 3: Cross multiply
    1,720.99x = 2,374.11 × 1,123.20
  4. Step 4: Simplify right side
    1,720.99x = 2,666,608.19
  5. Step 5: Solve for x
    x = 2,666,608.19/1,720.99
  6. Step 6: Final answer
    x = 1,549.47

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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.