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Finding the Fourth Proportional to 391,418.48, 540,157.47 and 221,685.41

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Solution

The fourth proportional to 391,418.48, 540,157.47 and 221,685.41 is: 305,925.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,418.48 : 540,157.47 = 221,685.41 : x
  2. Step 2: Convert to fraction form
    391,418.48/540,157.47 = 221,685.41/x
  3. Step 3: Cross multiply
    391,418.48x = 540,157.47 × 221,685.41
  4. Step 4: Simplify right side
    391,418.48x = 119,745,030,201.51
  5. Step 5: Solve for x
    x = 119,745,030,201.51/391,418.48
  6. Step 6: Final answer
    x = 305,925.85

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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.