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Finding the Fourth Proportional to 1,129.06, 1,557.12 and 736.21

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Solution

The fourth proportional to 1,129.06, 1,557.12 and 736.21 is: 1,015.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.06 : 1,557.12 = 736.21 : x
  2. Step 2: Convert to fraction form
    1,129.06/1,557.12 = 736.21/x
  3. Step 3: Cross multiply
    1,129.06x = 1,557.12 × 736.21
  4. Step 4: Simplify right side
    1,129.06x = 1,146,367.32
  5. Step 5: Solve for x
    x = 1,146,367.32/1,129.06
  6. Step 6: Final answer
    x = 1,015.33

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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.