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Finding the Fourth Proportional to 1,009, 1,392.89 and 589.29

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Solution

The fourth proportional to 1,009, 1,392.89 and 589.29 is: 813.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009 : 1,392.89 = 589.29 : x
  2. Step 2: Convert to fraction form
    1,009/1,392.89 = 589.29/x
  3. Step 3: Cross multiply
    1,009x = 1,392.89 × 589.29
  4. Step 4: Simplify right side
    1,009x = 820,816.15
  5. Step 5: Solve for x
    x = 820,816.15/1,009
  6. Step 6: Final answer
    x = 813.49

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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.