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Finding the Fourth Proportional to 746.34, 1,119.54 and 421.70

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Solution

The fourth proportional to 746.34, 1,119.54 and 421.70 is: 632.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.34 : 1,119.54 = 421.70 : x
  2. Step 2: Convert to fraction form
    746.34/1,119.54 = 421.70/x
  3. Step 3: Cross multiply
    746.34x = 1,119.54 × 421.70
  4. Step 4: Simplify right side
    746.34x = 472,110.02
  5. Step 5: Solve for x
    x = 472,110.02/746.34
  6. Step 6: Final answer
    x = 632.57

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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.