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Finding the Fourth Proportional to 1,053.80, 1,578.90 and 745.06

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Solution

The fourth proportional to 1,053.80, 1,578.90 and 745.06 is: 1,116.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.80 : 1,578.90 = 745.06 : x
  2. Step 2: Convert to fraction form
    1,053.80/1,578.90 = 745.06/x
  3. Step 3: Cross multiply
    1,053.80x = 1,578.90 × 745.06
  4. Step 4: Simplify right side
    1,053.80x = 1,176,375.23
  5. Step 5: Solve for x
    x = 1,176,375.23/1,053.80
  6. Step 6: Final answer
    x = 1,116.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.