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Finding the Fourth Proportional to 1,253.82, 1,729.95 and 805.48

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Solution

The fourth proportional to 1,253.82, 1,729.95 and 805.48 is: 1,111.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.82 : 1,729.95 = 805.48 : x
  2. Step 2: Convert to fraction form
    1,253.82/1,729.95 = 805.48/x
  3. Step 3: Cross multiply
    1,253.82x = 1,729.95 × 805.48
  4. Step 4: Simplify right side
    1,253.82x = 1,393,440.13
  5. Step 5: Solve for x
    x = 1,393,440.13/1,253.82
  6. Step 6: Final answer
    x = 1,111.36

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1.5x scale

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.