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Finding the Fourth Proportional to 1,213.76, 1,675.14 and 689.96

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Solution

The fourth proportional to 1,213.76, 1,675.14 and 689.96 is: 952.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.76 : 1,675.14 = 689.96 : x
  2. Step 2: Convert to fraction form
    1,213.76/1,675.14 = 689.96/x
  3. Step 3: Cross multiply
    1,213.76x = 1,675.14 × 689.96
  4. Step 4: Simplify right side
    1,213.76x = 1,155,779.59
  5. Step 5: Solve for x
    x = 1,155,779.59/1,213.76
  6. Step 6: Final answer
    x = 952.23

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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.