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Finding the Fourth Proportional to 390,930.06, 539,150.49 and 300,504.90

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Solution

The fourth proportional to 390,930.06, 539,150.49 and 300,504.90 is: 414,440.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,930.06 : 539,150.49 = 300,504.90 : x
  2. Step 2: Convert to fraction form
    390,930.06/539,150.49 = 300,504.90/x
  3. Step 3: Cross multiply
    390,930.06x = 539,150.49 × 300,504.90
  4. Step 4: Simplify right side
    390,930.06x = 162,017,364,082.40
  5. Step 5: Solve for x
    x = 162,017,364,082.40/390,930.06
  6. Step 6: Final answer
    x = 414,440.79

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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.