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Finding the Fourth Proportional to 983.46, 1,349.94 and 870.48

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Solution

The fourth proportional to 983.46, 1,349.94 and 870.48 is: 1,194.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.46 : 1,349.94 = 870.48 : x
  2. Step 2: Convert to fraction form
    983.46/1,349.94 = 870.48/x
  3. Step 3: Cross multiply
    983.46x = 1,349.94 × 870.48
  4. Step 4: Simplify right side
    983.46x = 1,175,095.77
  5. Step 5: Solve for x
    x = 1,175,095.77/983.46
  6. Step 6: Final answer
    x = 1,194.86

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.