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Finding the Fourth Proportional to 1,213.04, 1,674 and 689.06

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Solution

The fourth proportional to 1,213.04, 1,674 and 689.06 is: 950.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.04 : 1,674 = 689.06 : x
  2. Step 2: Convert to fraction form
    1,213.04/1,674 = 689.06/x
  3. Step 3: Cross multiply
    1,213.04x = 1,674 × 689.06
  4. Step 4: Simplify right side
    1,213.04x = 1,153,490.63
  5. Step 5: Solve for x
    x = 1,153,490.63/1,213.04
  6. Step 6: Final answer
    x = 950.91

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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.