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Finding the Fourth Proportional to 989, 1,365.08 and 569.40

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Solution

The fourth proportional to 989, 1,365.08 and 569.40 is: 785.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    989 : 1,365.08 = 569.40 : x
  2. Step 2: Convert to fraction form
    989/1,365.08 = 569.40/x
  3. Step 3: Cross multiply
    989x = 1,365.08 × 569.40
  4. Step 4: Simplify right side
    989x = 777,276.55
  5. Step 5: Solve for x
    x = 777,276.55/989
  6. Step 6: Final answer
    x = 785.92

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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.