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Finding the Fourth Proportional to 1,126.60, 1,555.41 and 728.47

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Solution

The fourth proportional to 1,126.60, 1,555.41 and 728.47 is: 1,005.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.60 : 1,555.41 = 728.47 : x
  2. Step 2: Convert to fraction form
    1,126.60/1,555.41 = 728.47/x
  3. Step 3: Cross multiply
    1,126.60x = 1,555.41 × 728.47
  4. Step 4: Simplify right side
    1,126.60x = 1,133,069.52
  5. Step 5: Solve for x
    x = 1,133,069.52/1,126.60
  6. Step 6: Final answer
    x = 1,005.74

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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.