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Finding the Fourth Proportional to 391,420.79, 540,151.53 and 230,286.21

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Solution

The fourth proportional to 391,420.79, 540,151.53 and 230,286.21 is: 317,789.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,420.79 : 540,151.53 = 230,286.21 : x
  2. Step 2: Convert to fraction form
    391,420.79/540,151.53 = 230,286.21/x
  3. Step 3: Cross multiply
    391,420.79x = 540,151.53 × 230,286.21
  4. Step 4: Simplify right side
    391,420.79x = 124,389,448,669.40
  5. Step 5: Solve for x
    x = 124,389,448,669.40/391,420.79
  6. Step 6: Final answer
    x = 317,789.58

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1.5x scale

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.