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Finding the Fourth Proportional to 1,043.17, 1,564.74 and 991.26

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Solution

The fourth proportional to 1,043.17, 1,564.74 and 991.26 is: 1,486.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.17 : 1,564.74 = 991.26 : x
  2. Step 2: Convert to fraction form
    1,043.17/1,564.74 = 991.26/x
  3. Step 3: Cross multiply
    1,043.17x = 1,564.74 × 991.26
  4. Step 4: Simplify right side
    1,043.17x = 1,551,064.17
  5. Step 5: Solve for x
    x = 1,551,064.17/1,043.17
  6. Step 6: Final answer
    x = 1,486.88

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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.