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Finding the Fourth Proportional to 740.30, 1,021.43 and 478

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Solution

The fourth proportional to 740.30, 1,021.43 and 478 is: 659.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.30 : 1,021.43 = 478 : x
  2. Step 2: Convert to fraction form
    740.30/1,021.43 = 478/x
  3. Step 3: Cross multiply
    740.30x = 1,021.43 × 478
  4. Step 4: Simplify right side
    740.30x = 488,243.54
  5. Step 5: Solve for x
    x = 488,243.54/740.30
  6. Step 6: Final answer
    x = 659.52

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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.