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Finding the Fourth Proportional to 983.58, 1,356.66 and 688.92

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Solution

The fourth proportional to 983.58, 1,356.66 and 688.92 is: 950.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.58 : 1,356.66 = 688.92 : x
  2. Step 2: Convert to fraction form
    983.58/1,356.66 = 688.92/x
  3. Step 3: Cross multiply
    983.58x = 1,356.66 × 688.92
  4. Step 4: Simplify right side
    983.58x = 934,630.21
  5. Step 5: Solve for x
    x = 934,630.21/983.58
  6. Step 6: Final answer
    x = 950.23

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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.