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Finding the Fourth Proportional to 391,657.68, 540,480.60 and 221,888.16

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Solution

The fourth proportional to 391,657.68, 540,480.60 and 221,888.16 is: 306,201.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,657.68 : 540,480.60 = 221,888.16 : x
  2. Step 2: Convert to fraction form
    391,657.68/540,480.60 = 221,888.16/x
  3. Step 3: Cross multiply
    391,657.68x = 540,480.60 × 221,888.16
  4. Step 4: Simplify right side
    391,657.68x = 119,926,245,849.70
  5. Step 5: Solve for x
    x = 119,926,245,849.70/391,657.68
  6. Step 6: Final answer
    x = 306,201.70

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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.