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Finding the Fourth Proportional to 391,441.68, 540,449.76 and 300,635.40

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Solution

The fourth proportional to 391,441.68, 540,449.76 and 300,635.40 is: 415,076.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,441.68 : 540,449.76 = 300,635.40 : x
  2. Step 2: Convert to fraction form
    391,441.68/540,449.76 = 300,635.40/x
  3. Step 3: Cross multiply
    391,441.68x = 540,449.76 × 300,635.40
  4. Step 4: Simplify right side
    391,441.68x = 162,478,329,777.50
  5. Step 5: Solve for x
    x = 162,478,329,777.50/391,441.68
  6. Step 6: Final answer
    x = 415,076.72

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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.