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Finding the Fourth Proportional to 983.55, 1,357.32 and 563.88

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Solution

The fourth proportional to 983.55, 1,357.32 and 563.88 is: 778.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.55 : 1,357.32 = 563.88 : x
  2. Step 2: Convert to fraction form
    983.55/1,357.32 = 563.88/x
  3. Step 3: Cross multiply
    983.55x = 1,357.32 × 563.88
  4. Step 4: Simplify right side
    983.55x = 765,362.78
  5. Step 5: Solve for x
    x = 765,362.78/983.55
  6. Step 6: Final answer
    x = 778.16

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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.