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Finding the Fourth Proportional to 740.64, 1,021.20 and 674.88

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Solution

The fourth proportional to 740.64, 1,021.20 and 674.88 is: 930.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.64 : 1,021.20 = 674.88 : x
  2. Step 2: Convert to fraction form
    740.64/1,021.20 = 674.88/x
  3. Step 3: Cross multiply
    740.64x = 1,021.20 × 674.88
  4. Step 4: Simplify right side
    740.64x = 689,187.46
  5. Step 5: Solve for x
    x = 689,187.46/740.64
  6. Step 6: Final answer
    x = 930.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.