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Finding the Fourth Proportional to 749.60, 1,125.30 and 744.20

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Solution

The fourth proportional to 749.60, 1,125.30 and 744.20 is: 1,117.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.60 : 1,125.30 = 744.20 : x
  2. Step 2: Convert to fraction form
    749.60/1,125.30 = 744.20/x
  3. Step 3: Cross multiply
    749.60x = 1,125.30 × 744.20
  4. Step 4: Simplify right side
    749.60x = 837,448.26
  5. Step 5: Solve for x
    x = 837,448.26/749.60
  6. Step 6: Final answer
    x = 1,117.19

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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.