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Finding the Fourth Proportional to 391.47, 540.28 and 293.06

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Solution

The fourth proportional to 391.47, 540.28 and 293.06 is: 404.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.47 : 540.28 = 293.06 : x
  2. Step 2: Convert to fraction form
    391.47/540.28 = 293.06/x
  3. Step 3: Cross multiply
    391.47x = 540.28 × 293.06
  4. Step 4: Simplify right side
    391.47x = 158,330.29
  5. Step 5: Solve for x
    x = 158,330.29/391.47
  6. Step 6: Final answer
    x = 404.45

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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.