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Finding the Fourth Proportional to 391,452.81, 540,171.90 and 217,027.68

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Solution

The fourth proportional to 391,452.81, 540,171.90 and 217,027.68 is: 299,479.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,452.81 : 540,171.90 = 217,027.68 : x
  2. Step 2: Convert to fraction form
    391,452.81/540,171.90 = 217,027.68/x
  3. Step 3: Cross multiply
    391,452.81x = 540,171.90 × 217,027.68
  4. Step 4: Simplify right side
    391,452.81x = 117,232,254,258.19
  5. Step 5: Solve for x
    x = 117,232,254,258.19/391,452.81
  6. Step 6: Final answer
    x = 299,479.91

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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.