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Finding the Fourth Proportional to 983.88, 1,359.18 and 811.08

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Solution

The fourth proportional to 983.88, 1,359.18 and 811.08 is: 1,120.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.88 : 1,359.18 = 811.08 : x
  2. Step 2: Convert to fraction form
    983.88/1,359.18 = 811.08/x
  3. Step 3: Cross multiply
    983.88x = 1,359.18 × 811.08
  4. Step 4: Simplify right side
    983.88x = 1,102,403.71
  5. Step 5: Solve for x
    x = 1,102,403.71/983.88
  6. Step 6: Final answer
    x = 1,120.47

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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.