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Finding the Fourth Proportional to 983.90, 1,357.90 and 564.26

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Solution

The fourth proportional to 983.90, 1,357.90 and 564.26 is: 778.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.90 : 1,357.90 = 564.26 : x
  2. Step 2: Convert to fraction form
    983.90/1,357.90 = 564.26/x
  3. Step 3: Cross multiply
    983.90x = 1,357.90 × 564.26
  4. Step 4: Simplify right side
    983.90x = 766,200.45
  5. Step 5: Solve for x
    x = 766,200.45/983.90
  6. Step 6: Final answer
    x = 778.74

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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.