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Finding the Fourth Proportional to 391,646.96, 540,471.48 and 221,913.44

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Solution

The fourth proportional to 391,646.96, 540,471.48 and 221,913.44 is: 306,239.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,646.96 : 540,471.48 = 221,913.44 : x
  2. Step 2: Convert to fraction form
    391,646.96/540,471.48 = 221,913.44/x
  3. Step 3: Cross multiply
    391,646.96x = 540,471.48 × 221,913.44
  4. Step 4: Simplify right side
    391,646.96x = 119,937,885,348.69
  5. Step 5: Solve for x
    x = 119,937,885,348.69/391,646.96
  6. Step 6: Final answer
    x = 306,239.80

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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.