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Finding the Fourth Proportional to 390,756.84, 539,125.38 and 218,656.95

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Solution

The fourth proportional to 390,756.84, 539,125.38 and 218,656.95 is: 301,679.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,756.84 : 539,125.38 = 218,656.95 : x
  2. Step 2: Convert to fraction form
    390,756.84/539,125.38 = 218,656.95/x
  3. Step 3: Cross multiply
    390,756.84x = 539,125.38 × 218,656.95
  4. Step 4: Simplify right side
    390,756.84x = 117,883,511,258.39
  5. Step 5: Solve for x
    x = 117,883,511,258.39/390,756.84
  6. Step 6: Final answer
    x = 301,679.97

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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.