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Finding the Fourth Proportional to 390,922.41, 539,443.12 and 218,800.95

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Solution

The fourth proportional to 390,922.41, 539,443.12 and 218,800.95 is: 301,928.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,922.41 : 539,443.12 = 218,800.95 : x
  2. Step 2: Convert to fraction form
    390,922.41/539,443.12 = 218,800.95/x
  3. Step 3: Cross multiply
    390,922.41x = 539,443.12 × 218,800.95
  4. Step 4: Simplify right side
    390,922.41x = 118,030,668,001.67
  5. Step 5: Solve for x
    x = 118,030,668,001.67/390,922.41
  6. Step 6: Final answer
    x = 301,928.63

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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.