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Finding the Fourth Proportional to 983.70, 1,357.80 and 689.04

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Solution

The fourth proportional to 983.70, 1,357.80 and 689.04 is: 951.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.70 : 1,357.80 = 689.04 : x
  2. Step 2: Convert to fraction form
    983.70/1,357.80 = 689.04/x
  3. Step 3: Cross multiply
    983.70x = 1,357.80 × 689.04
  4. Step 4: Simplify right side
    983.70x = 935,578.51
  5. Step 5: Solve for x
    x = 935,578.51/983.70
  6. Step 6: Final answer
    x = 951.08

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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.