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Finding the Fourth Proportional to 1,011.09, 1,395.09 and 591.31

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Solution

The fourth proportional to 1,011.09, 1,395.09 and 591.31 is: 815.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.09 : 1,395.09 = 591.31 : x
  2. Step 2: Convert to fraction form
    1,011.09/1,395.09 = 591.31/x
  3. Step 3: Cross multiply
    1,011.09x = 1,395.09 × 591.31
  4. Step 4: Simplify right side
    1,011.09x = 824,930.67
  5. Step 5: Solve for x
    x = 824,930.67/1,011.09
  6. Step 6: Final answer
    x = 815.88

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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.