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Finding the Fourth Proportional to 1,213.90, 1,675.18 and 689.96

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Solution

The fourth proportional to 1,213.90, 1,675.18 and 689.96 is: 952.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.90 : 1,675.18 = 689.96 : x
  2. Step 2: Convert to fraction form
    1,213.90/1,675.18 = 689.96/x
  3. Step 3: Cross multiply
    1,213.90x = 1,675.18 × 689.96
  4. Step 4: Simplify right side
    1,213.90x = 1,155,807.19
  5. Step 5: Solve for x
    x = 1,155,807.19/1,213.90
  6. Step 6: Final answer
    x = 952.14

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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.