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Finding the Fourth Proportional to 985.25, 1,359.78 and 571.25

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Solution

The fourth proportional to 985.25, 1,359.78 and 571.25 is: 788.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.25 : 1,359.78 = 571.25 : x
  2. Step 2: Convert to fraction form
    985.25/1,359.78 = 571.25/x
  3. Step 3: Cross multiply
    985.25x = 1,359.78 × 571.25
  4. Step 4: Simplify right side
    985.25x = 776,774.33
  5. Step 5: Solve for x
    x = 776,774.33/985.25
  6. Step 6: Final answer
    x = 788.40

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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.