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Finding the Fourth Proportional to 1,125.23, 1,549.26 and 991.98

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Solution

The fourth proportional to 1,125.23, 1,549.26 and 991.98 is: 1,365.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.23 : 1,549.26 = 991.98 : x
  2. Step 2: Convert to fraction form
    1,125.23/1,549.26 = 991.98/x
  3. Step 3: Cross multiply
    1,125.23x = 1,549.26 × 991.98
  4. Step 4: Simplify right side
    1,125.23x = 1,536,834.93
  5. Step 5: Solve for x
    x = 1,536,834.93/1,125.23
  6. Step 6: Final answer
    x = 1,365.80

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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.