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Finding the Fourth Proportional to 991.53, 1,368.11 and 571.82

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Solution

The fourth proportional to 991.53, 1,368.11 and 571.82 is: 788.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.53 : 1,368.11 = 571.82 : x
  2. Step 2: Convert to fraction form
    991.53/1,368.11 = 571.82/x
  3. Step 3: Cross multiply
    991.53x = 1,368.11 × 571.82
  4. Step 4: Simplify right side
    991.53x = 782,307.25
  5. Step 5: Solve for x
    x = 782,307.25/991.53
  6. Step 6: Final answer
    x = 788.99

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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.