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Finding the Fourth Proportional to 746.64, 1,119.96 and 313.20

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Solution

The fourth proportional to 746.64, 1,119.96 and 313.20 is: 469.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.64 : 1,119.96 = 313.20 : x
  2. Step 2: Convert to fraction form
    746.64/1,119.96 = 313.20/x
  3. Step 3: Cross multiply
    746.64x = 1,119.96 × 313.20
  4. Step 4: Simplify right side
    746.64x = 350,771.47
  5. Step 5: Solve for x
    x = 350,771.47/746.64
  6. Step 6: Final answer
    x = 469.80

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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.