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Finding the Fourth Proportional to 991.60, 1,368.24 and 577.52

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Solution

The fourth proportional to 991.60, 1,368.24 and 577.52 is: 796.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.60 : 1,368.24 = 577.52 : x
  2. Step 2: Convert to fraction form
    991.60/1,368.24 = 577.52/x
  3. Step 3: Cross multiply
    991.60x = 1,368.24 × 577.52
  4. Step 4: Simplify right side
    991.60x = 790,185.96
  5. Step 5: Solve for x
    x = 790,185.96/991.60
  6. Step 6: Final answer
    x = 796.88

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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.