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Finding the Fourth Proportional to 740.64, 1,021.49 and 478.20

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Solution

The fourth proportional to 740.64, 1,021.49 and 478.20 is: 659.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.64 : 1,021.49 = 478.20 : x
  2. Step 2: Convert to fraction form
    740.64/1,021.49 = 478.20/x
  3. Step 3: Cross multiply
    740.64x = 1,021.49 × 478.20
  4. Step 4: Simplify right side
    740.64x = 488,469.02
  5. Step 5: Solve for x
    x = 488,469.02/740.64
  6. Step 6: Final answer
    x = 659.53

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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.