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Finding the Fourth Proportional to 983.89, 1,357.20 and 615.25

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Solution

The fourth proportional to 983.89, 1,357.20 and 615.25 is: 848.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.89 : 1,357.20 = 615.25 : x
  2. Step 2: Convert to fraction form
    983.89/1,357.20 = 615.25/x
  3. Step 3: Cross multiply
    983.89x = 1,357.20 × 615.25
  4. Step 4: Simplify right side
    983.89x = 835,017.30
  5. Step 5: Solve for x
    x = 835,017.30/983.89
  6. Step 6: Final answer
    x = 848.69

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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.