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Finding the Fourth Proportional to 390,698.25, 539,166.84 and 211,850.25

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Solution

The fourth proportional to 390,698.25, 539,166.84 and 211,850.25 is: 292,355.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,698.25 : 539,166.84 = 211,850.25 : x
  2. Step 2: Convert to fraction form
    390,698.25/539,166.84 = 211,850.25/x
  3. Step 3: Cross multiply
    390,698.25x = 539,166.84 × 211,850.25
  4. Step 4: Simplify right side
    390,698.25x = 114,222,629,845.71
  5. Step 5: Solve for x
    x = 114,222,629,845.71/390,698.25
  6. Step 6: Final answer
    x = 292,355.11

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1.5x scale

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.