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Finding the Fourth Proportional to 1,129.23, 1,558.49 and 815.51

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Solution

The fourth proportional to 1,129.23, 1,558.49 and 815.51 is: 1,125.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.23 : 1,558.49 = 815.51 : x
  2. Step 2: Convert to fraction form
    1,129.23/1,558.49 = 815.51/x
  3. Step 3: Cross multiply
    1,129.23x = 1,558.49 × 815.51
  4. Step 4: Simplify right side
    1,129.23x = 1,270,952.31
  5. Step 5: Solve for x
    x = 1,270,952.31/1,129.23
  6. Step 6: Final answer
    x = 1,125.50

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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.