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Finding the Fourth Proportional to 390,809.92, 539,318.64 and 211,961.92

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Solution

The fourth proportional to 390,809.92, 539,318.64 and 211,961.92 is: 292,507.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,809.92 : 539,318.64 = 211,961.92 : x
  2. Step 2: Convert to fraction form
    390,809.92/539,318.64 = 211,961.92/x
  3. Step 3: Cross multiply
    390,809.92x = 539,318.64 × 211,961.92
  4. Step 4: Simplify right side
    390,809.92x = 114,315,014,426.19
  5. Step 5: Solve for x
    x = 114,315,014,426.19/390,809.92
  6. Step 6: Final answer
    x = 292,507.97

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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.