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Finding the Fourth Proportional to 989.11, 1,364.95 and 569.63

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Solution

The fourth proportional to 989.11, 1,364.95 and 569.63 is: 786.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.11 : 1,364.95 = 569.63 : x
  2. Step 2: Convert to fraction form
    989.11/1,364.95 = 569.63/x
  3. Step 3: Cross multiply
    989.11x = 1,364.95 × 569.63
  4. Step 4: Simplify right side
    989.11x = 777,520.59
  5. Step 5: Solve for x
    x = 777,520.59/989.11
  6. Step 6: Final answer
    x = 786.08

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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.