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Finding the Fourth Proportional to 390,745.59, 539,109.85 and 218,645.70

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Solution

The fourth proportional to 390,745.59, 539,109.85 and 218,645.70 is: 301,664.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,745.59 : 539,109.85 = 218,645.70 : x
  2. Step 2: Convert to fraction form
    390,745.59/539,109.85 = 218,645.70/x
  3. Step 3: Cross multiply
    390,745.59x = 539,109.85 × 218,645.70
  4. Step 4: Simplify right side
    390,745.59x = 117,874,050,530.15
  5. Step 5: Solve for x
    x = 117,874,050,530.15/390,745.59
  6. Step 6: Final answer
    x = 301,664.44

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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.