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Finding the Fourth Proportional to 520,091.60, 780,137.40 and 306,640.40

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Solution

The fourth proportional to 520,091.60, 780,137.40 and 306,640.40 is: 459,960.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,091.60 : 780,137.40 = 306,640.40 : x
  2. Step 2: Convert to fraction form
    520,091.60/780,137.40 = 306,640.40/x
  3. Step 3: Cross multiply
    520,091.60x = 780,137.40 × 306,640.40
  4. Step 4: Simplify right side
    520,091.60x = 239,221,644,390.96
  5. Step 5: Solve for x
    x = 239,221,644,390.96/520,091.60
  6. Step 6: Final answer
    x = 459,960.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.