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Finding the Fourth Proportional to 391,442.68, 540,451.14 and 300,636.40

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Solution

The fourth proportional to 391,442.68, 540,451.14 and 300,636.40 is: 415,078.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,442.68 : 540,451.14 = 300,636.40 : x
  2. Step 2: Convert to fraction form
    391,442.68/540,451.14 = 300,636.40/x
  3. Step 3: Cross multiply
    391,442.68x = 540,451.14 × 300,636.40
  4. Step 4: Simplify right side
    391,442.68x = 162,479,285,105.50
  5. Step 5: Solve for x
    x = 162,479,285,105.50/391,442.68
  6. Step 6: Final answer
    x = 415,078.10

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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.