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Finding the Fourth Proportional to 983.88, 1,357.68 and 564.21

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Solution

The fourth proportional to 983.88, 1,357.68 and 564.21 is: 778.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.88 : 1,357.68 = 564.21 : x
  2. Step 2: Convert to fraction form
    983.88/1,357.68 = 564.21/x
  3. Step 3: Cross multiply
    983.88x = 1,357.68 × 564.21
  4. Step 4: Simplify right side
    983.88x = 766,016.63
  5. Step 5: Solve for x
    x = 766,016.63/983.88
  6. Step 6: Final answer
    x = 778.57

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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.