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Finding the Fourth Proportional to 1,720.17, 2,580.66 and 991.17

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Solution

The fourth proportional to 1,720.17, 2,580.66 and 991.17 is: 1,486.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.17 : 2,580.66 = 991.17 : x
  2. Step 2: Convert to fraction form
    1,720.17/2,580.66 = 991.17/x
  3. Step 3: Cross multiply
    1,720.17x = 2,580.66 × 991.17
  4. Step 4: Simplify right side
    1,720.17x = 2,557,872.77
  5. Step 5: Solve for x
    x = 2,557,872.77/1,720.17
  6. Step 6: Final answer
    x = 1,486.99

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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.