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Finding the Fourth Proportional to 391,503.38, 540,312.36 and 219,420.50

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Solution

The fourth proportional to 391,503.38, 540,312.36 and 219,420.50 is: 302,821.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,503.38 : 540,312.36 = 219,420.50 : x
  2. Step 2: Convert to fraction form
    391,503.38/540,312.36 = 219,420.50/x
  3. Step 3: Cross multiply
    391,503.38x = 540,312.36 × 219,420.50
  4. Step 4: Simplify right side
    391,503.38x = 118,555,608,187.38
  5. Step 5: Solve for x
    x = 118,555,608,187.38/391,503.38
  6. Step 6: Final answer
    x = 302,821.42

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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.