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Finding the Fourth Proportional to 989.51, 1,365.57 and 569.97

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Solution

The fourth proportional to 989.51, 1,365.57 and 569.97 is: 786.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.51 : 1,365.57 = 569.97 : x
  2. Step 2: Convert to fraction form
    989.51/1,365.57 = 569.97/x
  3. Step 3: Cross multiply
    989.51x = 1,365.57 × 569.97
  4. Step 4: Simplify right side
    989.51x = 778,333.93
  5. Step 5: Solve for x
    x = 778,333.93/989.51
  6. Step 6: Final answer
    x = 786.59

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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.