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Finding the Fourth Proportional to 1,291.98, 1,938.24 and 746.58

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Solution

The fourth proportional to 1,291.98, 1,938.24 and 746.58 is: 1,120.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.98 : 1,938.24 = 746.58 : x
  2. Step 2: Convert to fraction form
    1,291.98/1,938.24 = 746.58/x
  3. Step 3: Cross multiply
    1,291.98x = 1,938.24 × 746.58
  4. Step 4: Simplify right side
    1,291.98x = 1,447,051.22
  5. Step 5: Solve for x
    x = 1,447,051.22/1,291.98
  6. Step 6: Final answer
    x = 1,120.03

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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.