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Finding the Fourth Proportional to 1,231.26, 1,699.12 and 707.40

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Solution

The fourth proportional to 1,231.26, 1,699.12 and 707.40 is: 976.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.26 : 1,699.12 = 707.40 : x
  2. Step 2: Convert to fraction form
    1,231.26/1,699.12 = 707.40/x
  3. Step 3: Cross multiply
    1,231.26x = 1,699.12 × 707.40
  4. Step 4: Simplify right side
    1,231.26x = 1,201,957.49
  5. Step 5: Solve for x
    x = 1,201,957.49/1,231.26
  6. Step 6: Final answer
    x = 976.20

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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.