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Finding the Fourth Proportional to 926.90, 1,393.56 and 745.55

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Solution

The fourth proportional to 926.90, 1,393.56 and 745.55 is: 1,120.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.90 : 1,393.56 = 745.55 : x
  2. Step 2: Convert to fraction form
    926.90/1,393.56 = 745.55/x
  3. Step 3: Cross multiply
    926.90x = 1,393.56 × 745.55
  4. Step 4: Simplify right side
    926.90x = 1,038,968.66
  5. Step 5: Solve for x
    x = 1,038,968.66/926.90
  6. Step 6: Final answer
    x = 1,120.91

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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.