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Finding the Fourth Proportional to 1,243.25, 1,715.69 and 691.25

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Solution

The fourth proportional to 1,243.25, 1,715.69 and 691.25 is: 953.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.25 : 1,715.69 = 691.25 : x
  2. Step 2: Convert to fraction form
    1,243.25/1,715.69 = 691.25/x
  3. Step 3: Cross multiply
    1,243.25x = 1,715.69 × 691.25
  4. Step 4: Simplify right side
    1,243.25x = 1,185,967.26
  5. Step 5: Solve for x
    x = 1,185,967.26/1,243.25
  6. Step 6: Final answer
    x = 953.93

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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.