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Finding the Fourth Proportional to 391,054.03, 539,664.12 and 218,970.54

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Solution

The fourth proportional to 391,054.03, 539,664.12 and 218,970.54 is: 302,184.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,054.03 : 539,664.12 = 218,970.54 : x
  2. Step 2: Convert to fraction form
    391,054.03/539,664.12 = 218,970.54/x
  3. Step 3: Cross multiply
    391,054.03x = 539,664.12 × 218,970.54
  4. Step 4: Simplify right side
    391,054.03x = 118,170,543,775.03
  5. Step 5: Solve for x
    x = 118,170,543,775.03/391,054.03
  6. Step 6: Final answer
    x = 302,184.70

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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.